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A fortification is a or designed for the defense of territories in , and is also used to establish rule in a region during peacetime. The term is derived from fortis ("strong") and facere ("to make").

From very early history to modern times, have often been necessary for cities to survive in an ever-changing world of invasion and conquest. Some settlements in the Indus Valley civilization were the first small cities to be fortified. In , large stone walls had been built in , such as the ancient site of (famous for the huge stone blocks of its '' walls). A Greek phrourion was a fortified collection of buildings used as a military , and is the equivalent of the or fortress. These constructions mainly served the purpose of a watch tower, to guard certain roads, passes, and borders. Though smaller than a real fortress, they acted as a border guard rather than a real strongpoint to watch and maintain the border.

The art of setting out a military camp or constructing a fortification traditionally has been called "castrametation" since the time of the . Fortification is usually divided into two branches: permanent fortification and field fortification. There is also an intermediate branch known as semi-permanent fortification. are fortifications which are regarded as being distinct from the generic fort or fortress in that they are a residence of a or and command a specific defensive territory.

and were the main antecedents of castles in , which emerged in the 9th century in the Carolingian Empire. The Early Middle Ages saw the creation of some towns built around castles.

Medieval-style fortifications were largely made obsolete by the arrival of in the 14th century. Fortifications in the age of evolved into much lower structures with greater use of ditches and earth ramparts that would absorb and disperse the energy of cannon fire. Walls exposed to direct cannon fire were very vulnerable, so the walls were sunk into ditches fronted by earth slopes to improve protection.

The arrival of in the 19th century led to yet another stage in the evolution of fortification. did not fare well against the effects of high explosive, and the intricate arrangements of bastions, flanking batteries and the carefully constructed lines of fire for the defending cannon could be rapidly disrupted by explosive shells. -and- fortifications were common during the 19th and early 20th centuries. The advances in modern warfare since World War I have made large-scale fortifications in most situations.

Many United States Army installations are known as forts, although they are not always fortified. Indeed, during the pioneering era of North America, many outposts on the frontiers, even non-military outposts, were referred to generically as forts. Larger military installations may be called fortresses; smaller ones were once known as fortalices. The word fortification can also refer to the practice of improving an area's defense with defensive works. City are fortifications but are not necessarily called fortresses.

The art of setting out a military camp or constructing a fortification traditionally has been called since the time of the . The art/science of laying to a fortification and of destroying it is commonly called or siege warfare and is formally known as . In some texts this latter term also applies to the art of building a fortification.

Fortification is usually divided into two branches: permanent fortification and field fortification. Permanent fortifications are erected at leisure, with all the resources that a state can supply of constructive and mechanical skill, and are built of enduring materials. Field fortifications—for example breastworks—and often known as fieldworks or earthworks, are extemporized by troops in the field, perhaps assisted by such local labour and tools as may be procurable and with materials that do not require much preparation, such as , brushwood and light , or sandbags (see sangar). An example of field fortification was the construction of Fort Necessity by George Washington in 1754.

There is also an intermediate branch known as semi-permanent fortification. This is employed when in the course of a campaign it becomes desirable to protect some locality with the best imitation of permanent defences that can be made in a short time, ample resources and skilled civilian labour being available. An example of this is the construction of and in other Roman territories where camps were set up with the intention of staying for some time, but not permanently.

are fortifications which are regarded as being distinct from the generic fort or fortress in that it describes a residence of a or and commands a specific defensive territory. An example of this is the massive medieval castle of .


Neolithic Europe
From very early history to modern times, have been a necessity for many cities. In Bulgaria, near the town of a walled fortified settlement today called starting from 4700 BC had a diameter of about , was home to 350 people living in two-storey houses, and was encircled by a fortified wall. The huge walls around the settlement, which were built very tall and with stone blocks which are high and thick, make it one of the earliest walled settlements in Europe but it is younger than the walled town of in Greece from 6800 BC. in ancient () is one of the world's oldest known . The Ancient Egyptians also built fortresses on the frontiers of the to protect against invaders from neighbouring territories, as well as circle-shaped mud brick walls around their cities. Many of the fortifications of the ancient world were built with mud brick, often leaving them no more than mounds of dirt for today's archaeologists.

A massive prehistoric stone wall surrounded the ancient temple of Ness of Brodgar 3200 BC in . Named the "Great Wall of Brodgar" it was thick and 4 metres tall. The wall had some symbolic or ritualistic function. The Assyrians deployed large labour forces to build new , temples and defensive walls.

(1996). 9780750622677, Architectural Press.

Neolithic Indus Valley
Some settlements in the Indus Valley civilization were also fortified. By about 3500 BC, hundreds of small farming villages dotted the floodplain. Many of these settlements had fortifications and planned streets. The stone and mud brick houses of were clustered behind massive stone flood dykes and defensive walls, for neighbouring communities bickered constantly about the control of prime agricultural land.
(2022). 9780395652374, Houghton Mifflin Books.
(c. 2500 BC) in present-day south-east has defensive walls and square of sun dried bricks.
(1996). 9780750622677, Architectural Press.
The entire city of in was encompassed by fortified walls surrounded by a ditch. Archaeology has revealed various Bronze Age bastions and foundations constructed of stone together with either baked or unfired brick.
(2022). 9780313325014, Greenwood Publishing Group.

Bronze Age Europe
In , some settlements also began to be fortified. The most notable surviving example is Borġ in-Nadur, where a bastion built in around 1500 BC was found. was one of the most famous cities of the ancient world, especially as a result of the building program of , who expanded the walls and built the . Exceptions were few—notably, ancient and ancient did not have walls for a long time, choosing to rely on their militaries for defence instead. Initially, these fortifications were simple constructions of wood and earth, which were later replaced by mixed constructions of stones piled on top of each other without mortar. In , large stone walls had been built in , such as the ancient site of (famous for the huge stone blocks of its '' walls). In , the city of built two parallel stone walls, called the , that reached their fortified seaport at a few miles away.

In , the built large fortified settlements known as , whose walls seem partially influenced by those built in the . The fortifications were continuously being expanded and improved. Around 600 BC, in , Germany, forts were constructed with a limestone foundation supported by a wall approximately 4 metres tall, probably topped by a roofed walkway, thus reaching a total height of 6 metres. The wall was clad with lime plaster, regularly renewed. Towers protruded outwards from it.

The Oppidum of Manching (German: Oppidum von Manching) was a large Celtic proto-urban or city-like settlement at modern-day Manching (near Ingolstadt), Bavaria (Germany). The settlement was founded in the 3rd century BC and existed until c. 50–30 BC. It reached its largest extent during the late La Tène period (late 2nd century BC), when it had a size of 380 hectares. At that time, 5,000 to 10,000 people lived within its 7.2 km long walls. The oppidum of is another example of a Gaulish fortified settlement.

Bronze and Iron Age Near East

Ancient Rome
The are a line of built between 271 AD and 275 AD in , , during the reign of the and Probus. The walls enclosed all the seven hills of Rome plus the and, on the right bank of the , the district. The river banks within the city limits appear to have been left unfortified, although they were fortified along the Campus Martius. The full circuit ran for surrounding an area of . The walls were constructed in brick-faced concrete, thick and high, with a square tower every 100 Roman feet (). In the 5th century, remodelling doubled the height of the walls to . By 500 AD, the circuit possessed 383 towers, 7,020 , 18 main gates, 5 , 116 , and 2,066 large external windows.Claridge, Amanda (1998). Rome: An Oxford Archaeological Guide, First, Oxford, UK: Oxford University Press, 1998, pp. 59, 332–335.

The fortified their cities with massive, mortar-bound stone walls. The most famous of these are the largely extant of and the of , together with partial remains elsewhere. These are mostly city gates, like the in or in Lincoln. Hadrian's Wall was built by the across the width of what is now following a visit by Roman Emperor (AD 76–138) in AD 122.

A number of forts dating from the Later Stone Age to the may be found in India. "Fort" is the word used in India for all old fortifications. Numerous Indus Valley Civilization sites exhibit evidences of fortifications. While has stone-built fortification walls, is fortified using baked bricks; sites such as exhibit fortifications with bastions and has a quadrangular fortified layout. Evidence also suggested of fortifications in . Even a small town – for instance, Kotada Bhadli, exhibiting sophisticated fortification-like bastions – shows that nearly all major and minor towns of the Indus Valley Civilization were fortified. Forts also appeared in urban cities of the Gangetic valley during the second urbanisation period between 600 and 200 BC, and as many as 15 fortification sites have been identified by archaeologists throughout the Gangetic valley, such as , , , , , , and Lauria Nandangarh. The earliest vedic brick fortification occurs in one of the stupa mounds of Lauria Nandangarh, which is 1.6 km in perimeter and oval in plan and encloses a habitation area. India currently has over 180 forts, with the state of alone having over 70 forts, which are also known as durg, Durga is the word for "inaccessible place", hence "fort"
(1991). 9788120810006, Motilal Banarsidass.
many of them built by , founder of the . A large majority of forts in India are in North India. The most notable forts are the at , the at , the and in , the , and also in Rajasthan and in .
(2022). 9781780969855, Osprey Publishing.

Large tempered earth (i.e. ) walls were built in since the (c. 1600–1050 BC); the capital at ancient Ao had enormous walls built in this fashion (see for more info). Although stone walls were built in China during the (481–221 BC), mass conversion to stone architecture did not begin in earnest until the (618–907 AD). The Great Wall of China had been built since the (221–207 BC), although its present form was mostly an engineering feat and remodelling of the (1368–1644 AD).

In addition to the Great Wall, a number of Chinese cities also employed the use of to defend their cities. Notable Chinese city walls include the city walls of Hangzhou, Nanjing, the Old City of Shanghai, Suzhou, Xi'an and the walled villages of Hong Kong. The famous walls of the in were established in the early 15th century by the . The Forbidden City made up the inner portion of the Beijing city fortifications.


Spanish colonial fortifications
During the Spanish Era several forts and outposts were built throughout the archipelago. Most notable is , the old city of Manila located along the southern bank of the .Luengo, Pedro. Intramuros: Arquitectura en Manila, 1739–1762. Madrid: Fundacion Universitaria Española, 2012 The historic city was home to centuries-old churches, schools, convents, government buildings and residences, the best collection of Spanish colonial architecture before much of it was destroyed by the bombs of World War II. Of all the buildings within the 67-acre city, only one building, the San Agustin Church, survived the war.

Partial listing of Spanish forts:

  1. ,
  2. Cuartel de Santo Domingo, Santa Rosa, Laguna
  3. , Cuyo, Palawan
  4. Fuerza de Cagayancillo, ,
  5. ,
  6. Fuerza de San Felipe,
  7. Fuerza de San Pedro,
  8. Fuerte dela Concepcion y del Triunfo, , Misamis Occidental
  9. Fuerza de San Antonio Abad,
  10. , Pikit, Cotabato
  11. Fuerza de Santiago, Romblon, Romblon
  12. Fuerza de Jolo, Jolo, Sulu
  13. ,
  14. Fuerza de Bongabong, Bongabong, Oriental Mindoro
  15. , , Zamboanga del Norte
  16. Fuerte de Alfonso XII, Tukuran, Zamboanga del Sur
  17. Fuerza de Bacolod, Bacolod, Lanao del Norte
  18. Guinsiliban Watchtower, Guinsiliban, Camiguin
  19. Laguindingan Watchtower, Laguindingan, Misamis Oriental
  20. , Gumaca, Quezon
  21. Baluarte Luna, Luna, La Union

Local fortifications
The Ivatan people of the northern islands of Batanes built their so-called on hills and elevated areas to protect themselves during times of war. These fortifications were likened to European castles because of their purpose. Usually, the only entrance to the castles would be via a rope ladder that would only be lowered for the villagers and could be kept away when invaders arrived.

The built forts made of stone walls that averaged several meters in width and about two to three times the width in height around 2000 BC. Ancient and Pre-Spanish Era of the Philippines . Accessed September 04, 2008.

The Muslim Filipinos of the south built strong called kota or moong to protect their communities. Usually, many of the occupants of these kotas are entire families rather than just warriors. Lords often had their own kotas to assert their right to rule, it served not only as a military installation but as a palace for the local Lord. It is said that at the height of the Maguindanao Sultanate's power, they blanketed the areas around Western with Kotas and other fortifications to block the Spanish advance into the region. These kotas were usually made of stone and bamboo or other light materials and surrounded by trench networks. As a result, some of these kotas were burned easily of destroyed. With further Spanish campaigns in the region, the Sultanate was subdued and majority of Kotas dismantled or destroyed. Kotas were not only used by the Muslims as defense against Spaniards and other foreigners, renegades and rebels also built fortifications in defiance of other chiefs in the area. During the American occupation, rebels built strongholds and the Datus, Rajahs or Sultans often built and reinforced their kotas in a desperate bid to maintain rule over their subjects and their land. Many of these forts were also destroyed by American expeditions, as a result, very very few kotas still stand to this day.

Notable Kotas:

  • Kota Selurong: an outpost of the in Luzon, later became the City of .
  • : Literally translates to "stone fort" the first known stone fortification in the country, its ruins exist as the "Kutawato Cave Complex"
  • Kota Sug/Jolo: The capital and seat of the Sultanate of Sulu. When it was occupied by the Spaniards in the 1870s they converted the kota into the world's smallest walled city.

Pre-Islamic Arabia

During Muhammad's lifetime
During 's era in Arabia, many tribes made use of fortifications. In the Battle of the Trench, the largely outnumbered defenders of Medina, mainly led by Islamic prophet Muhammad, dug a trench, which together with Medina's natural fortifications, rendered the confederate (consisting of horses and ) useless, locking the two sides in a stalemate. Hoping to make several attacks at once, the confederates persuaded the Medina-allied to attack the city from the south. However, Muhammad's diplomacy derailed the negotiations, and broke up the confederacy against him. The well-organized defenders, the sinking of confederate morale, and poor weather conditions caused the siege to end in a fiasco.*
(1974). 9780198810780, Oxford University Press. .

During the Siege of Ta'if in January 630, Note: Shawwal 8AH is January 630AD Muhammad ordered his followers to attack enemies who fled from the Battle of Hunayn and sought refuge in the fortress of Taif.

Islamic world

The walls of Benin are described as the world's second longest man-made structure, as well as the most extensive earthwork in the world, by the Guinness Book of Records, 1974.
(1999). 9780195170559, Basic Civitas Books.
Osadolor, pp. 6–294 The walls may have been constructed between the thirteenth and mid-fifteenth century CE or, during the first millennium CE. Strong citadels were also built other in areas of Africa. Yorubaland for example had several sites surrounded by the full range of earthworks and ramparts seen elsewhere, and sited on ground. This improved defensive potential- such as hills and ridges. Yoruba fortifications were often protected with a double wall of trenches and ramparts, and in the Congo forests concealed and paths, along with the main works, often bristled with rows of sharpened stakes. Inner defenses were laid out to blunt an enemy penetration with a maze of defensive walls allowing for entrapment and on opposing forces.July, pp. 11–39

A military tactic of the was to create powerful log at key points. This was employed in later wars against the to block British advances. Some of these fortifications were over a hundred yard long, with heavy parallel tree trunks. They were impervious to destruction by artillery fire. Behind these stockades numerous Ashanti soldiers were mobilized to check enemy movement. While formidable in construction, many of these strongpoints failed because Ashanti guns, gunpowder and bullets were poor, and provided little sustained killing power in defense. Time and time again British troops overcame or bypassed the stockades by mounting old-fashioned bayonet charges, after laying down some covering fire.The Ashanti campaign of 1900, (1908) By Sir Cecil Hamilton Armitage, Arthur Forbes Montanaro, (1901) Sands and Co. pgs 130–131

Defensive works were of importance in the tropical African Kingdoms. In the Kingdom of Kongo field fortifications were characterized by trenches and low earthen embankments. Such strongpoints ironically, sometimes held up much better against European cannon than taller, more imposing structures.Thornton, pp. 22–39

Medieval Europe
and were the main antecedents of in , which emerged in the 9th century in the Carolingian Empire. The Early Middle Ages saw the creation of some towns built around castles. These cities were only rarely protected by simple stone walls and more usually by a combination of both walls and ditches. From the 12th century hundreds of settlements of all sizes were founded all across Europe, which very often obtained the right of fortification soon afterwards.

The founding of urban centres was an important means of territorial expansion and many cities, especially in , were founded precisely for this purpose during the period of . These cities are easy to recognise due to their regular layout and large market spaces. The fortifications of these settlements were continuously improved to reflect the current level of military development. During the , the Venetian Republic raised great walls around cities, and the finest examples, among others, are in (Cyprus), Rocca di Manerba del Garda (Lombardy) and (Italy), or (Croatia), which proved to be futile against attacks but still stand to this day. Unlike Venetians the Ottomans used to built smaller fortifications but in greater numbers, and only rarely fortified entire settlements such as Počitelj, Vratnik and Jajce in .

Development after introduction of firearms
Medieval-style fortifications were largely made obsolete by the arrival of on the 14th century . Fortifications in the age of evolved into much lower structures with greater use of ditches and earth ramparts that would absorb and disperse the energy of cannon fire. Walls exposed to direct cannon fire were very vulnerable, so were sunk into ditches fronted by earth slopes.

This placed a heavy emphasis on the of the fortification to allow defensive cannonry interlocking fields of fire to cover all approaches to the lower and thus more vulnerable walls. The evolution of this new style of fortification can be seen in transitional forts such as SarzanelloHarris, J., "Sarzana and Sarzanello – Transitional Design and Renaissance Designers" , Fort (Fortress Study Group), No. 37, 2009, pp. 50–78 in North West Italy which was built between 1492 and 1502. Sarzanello consists of both crenellated walls with towers typical of the medieval period but also has a like angular gun platform screening one of the curtain walls which is protected from flanking fire from the towers of the main part of the fort. Another example are the fortifications of Rhodes which were frozen at 1522 so that Rhodes is the only European walled town that still shows the transition between the classical medieval fortification and the modern ones.

Fortifications also extended in depth, with protected batteries for defensive cannonry, to allow them to engage attacking cannon to keep them at a distance and prevent them bearing directly on the vulnerable walls.

The result was with tier upon tier of hornworks and , of which is an excellent example. There are also extensive fortifications from this era in the states and in , the fortifications of Berwick-upon-Tweed and the harbour of at being fine examples.

19th century
The arrival of in the 19th century led to yet another stage in the evolution of fortification. did not fare well against the effects of high explosive and the intricate arrangements of bastions, flanking batteries and the carefully constructed lines of fire for the defending cannon could be rapidly disrupted by explosive shells. Worse, the large open ditches surrounding forts of this type were an integral part of the defensive scheme, as was the covered way at the edge of the . The ditch was extremely vulnerable to bombardment with explosive shells.

In response, military engineers evolved the style of fortification. The ditch became deep and vertically sided, cut directly into the native rock or soil, laid out as a series of straight lines creating the central fortified area that gives this style of fortification its name.

Wide enough to be an impassable barrier for attacking troops, but narrow enough to be a difficult target for enemy shellfire, the ditch was swept by fire from defensive set in the ditch as well as firing positions cut into the outer face of the ditch itself.

The profile of the fort became very low indeed, surrounded outside the ditch covered by by a gently sloping open area so as to eliminate possible cover for enemy forces, while the fort itself provided a minimal target for enemy fire. The entrypoint became a sunken gatehouse in the inner face of the ditch, reached by a curving ramp that gave access to the gate via a rolling bridge that could be withdrawn into the gatehouse. Much of the fort moved underground. Deep passages and now connected the and firing points in the ditch to the fort proper, with magazines and machine rooms deep under the surface. The guns, however, were often mounted in open emplacements and protected only by a ; both in order to keep a lower profile and also because experience with guns in closed had seen them put out of action by rubble as their own casemates were collapsed around them.

Gone were citadels surrounding towns: forts were to be moved to the outside of the cities some 12 km to keep the enemy at a distance so their artillery could not bombard the city center. From now on a ring of forts were to be built at a spacing that would allow them to effectively cover the intervals between them.

The new forts abandoned the principle of the bastion, which had also been made obsolete by advances in arms. The outline was a much simplified polygon, surrounded by a ditch. These forts, built in masonry and shaped stone, were designed to shelter their garrison against bombardment. One organizing feature of the new system involved the construction of two defensive curtains: an outer line of forts, backed by an inner ring or line at critical points of terrain or junctions (see, for example, Séré de Rivières system in France).

Traditional fortification however continued to be applied by European armies engaged in warfare in colonies established in Africa against lightly armed attackers from amongst the indigenous population. A relatively small number of defenders in a fort impervious to primitive weaponry could hold out against high odds, the only constraint being the supply of ammunition.

20th and 21st centuries
-and- fortifications were common during the 19th and early 20th centuries. However the advances in modern warfare since World War I have made large-scale fortifications in most situations. In the 1930s and 1940s, some fortifications were built with designs taking into consideration the new threat of , for example Fort Campbell in Malta. Despite this, only underground are still able to provide some protection in modern wars. Many historical fortifications were demolished during the modern age, but a considerable number survive as popular tourist destinations and prominent local today.

The downfall of permanent fortifications had two causes:

  • The ever-escalating power, speed, and reach of artillery and air power meant that almost any target that could be located could be destroyed, if sufficient force were massed against it. As such, the more resources a defender devoted to reinforcing a fortification, the more combat power that fortification justified being devoted to destroying it, if the fortification's destruction was demanded by an attacker's strategy. From World War II, were used against fortifications. By 1950, were capable of destroying entire cities, and produced dangerous . This led to the creation of civilian nuclear air raid shelters.
  • The second weakness of permanent fortification was its very permanency. Because of this it was often easier to go around a fortification and, with the rise of mobile warfare in the beginning of World War II, this became a viable offensive choice. When a defensive line was too extensive to be entirely bypassed, massive offensive might could be massed against one part of the line allowing a breakthrough, after which the rest of the line could be bypassed. Such was the fate of the many defensive lines built before and during World War II, such as the , the and the . This was not the case with the ; it was designed to force the Germans to invade other countries (Belgium or Switzerland) to go around it, and was successful in that sense.
    (2022). 9782952309257, Moselle River.
Instead field fortification rose to dominate defensive action. Unlike the which dominated World War I, these defences were more temporary in nature. This was an advantage because since it was less extensive it formed a less obvious target for enemy force to be directed against.

If sufficient power were massed against one point to penetrate it, the forces based there could be withdrawn and the line could be re-established relatively quickly. Instead of a supposedly impenetrable defensive line, such fortifications emphasized defence in depth, so that as defenders were forced to pull back or were overrun, the lines of defenders behind them could take over the defence.

Because the mobile offensives practised by both sides usually focused on avoiding the strongest points of a defensive line, these defences were usually relatively thin and spread along the length of a line. The defence was usually not equally strong throughout however.

The strength of the defensive line in an area varied according to how rapidly an attacking force could progress in the terrain that was being defended—both the terrain the defensive line was built on and the ground behind it that an attacker might hope to break out into. This was both for reasons of the strategic value of the ground, and its defensive value.

This was possible because while offensive tactics were focused on mobility, so were defensive tactics. The dug in defences consisted primarily of infantry and antitank guns. Defending tanks and tank destroyers would be concentrated in mobile behind the defensive line. If a major offensive was launched against a point in the line, mobile reinforcements would be sent to reinforce that part of the line that was in danger of failing.

Thus the defensive line could be relatively thin because the bulk of the fighting power of the defenders was not concentrated in the line itself but rather in the mobile reserves. A notable exception to this rule was seen in the defensive lines at the Battle of Kursk during World War II, where German forces deliberately attacked into the strongest part of the defences seeking to crush them utterly.

The that was being defended was of primary importance because that tanks could move over quickly made possible rapid advances into the defenders' rear areas that were very dangerous to the defenders. Thus such terrain had to be defended at all cost.

In addition, since in theory the defensive line only had to hold out long enough for mobile reserves to reinforce it, terrain that did not permit rapid advance could be held more weakly because the enemy's advance into it would be slower, giving the defenders more time to reinforce that point in the line. For example, the Battle of the Hurtgen Forest in Germany during the closing stages of World War II is an excellent example of how difficult terrain could be used to the defenders' advantage. After World War II, intercontinental ballistic missiles capable of reaching much of the way around the world were developed, and so speed became an essential characteristic of the strongest militaries and defenses. were developed, so missiles could be fired from the middle of a country and hit cities and targets in another country, and airplanes (and air carriers) became major defenses and offensive weapons (leading to an expansion of the use of airports and airstrips as fortifications). Mobile defenses could be had underwater, too, in the form of nuclear submarines capable of firing missiles. Some bunkers in the mid to late 20th century came to be buried deep inside mountains and prominent rocks, such as and the Cheyenne Mountain Complex. On the ground itself, have been used as hidden defences in modern warfare, often remaining long after the wars that produced them have ended.

Demilitarized zones along borders are arguably another type of fortification, although a passive kind, providing a buffer between potentially hostile militaries.

Military airfields
Military airfields offer a fixed "target rich" environment for even relatively small enemy forces, using hit-and-run tactics by ground forces, stand-off attacks (mortars and rockets), air attacks, or ballistic missiles. Key targets – aircraft, munitions, fuel, and vital technical personnel – can be protected by fortifications.

Aircraft can be protected by , , or hardened aircraft shelters which will protect from many types of attack. Larger aircraft types tend to be based outside the operational theatre.

Munition storage follows safety rules which use fortifications (bunkers and bunds) to provide protection against accident and chain reactions (sympathetic detonations). Weapons for rearming aircraft can be stored in small fortified expense stores closer to the aircraft. At Bien Hoa South Vietnam on the morning of 16 May 1965, as aircraft were being re-fuelled and armed, a chain reaction explosion destroyed 13 aircraft, killed 34 personnel, and injured over 100; this, along with damage and losses of aircraft to enemy attack (by both infiltration and stand off attacks), led to the construction of revetments and shelters to protect aircraft throughout South Vietnam.

Aircrew and ground personnel will need protection during enemy attacks and fortifications range from culvert section "duck and cover" shelters to permanent air-raid shelters. Soft locations with high personnel densities such as accommodation and messing facilities can have limited protection by placing prefabricated concrete walls or barriers around them, examples of barriers are Jersey Barriers, T Barriers or Splinter Protection Units (SPUs). Older fortification may prove useful such as the old 'Yugo' pyramid shelters built in the 1980s which were used by US personnel on 8 Jan 2020 when Iran fired 11 ballistic missiles at Ayn al-Asad Airbase in Iraq.

Fuel is volatile and has to comply with rules for storage which provide protection against accident. Fuel in underground bulk fuel installations is well protected though valves and controls are vulnerable to enemy action. Above ground tanks can be susceptible to attack.

Ground support equipment will need to be protected by fortifications to be usable after an enemy attack.

Permanent (concrete) guard fortifications are safer, stronger, last longer and are more cost effective than sandbag fortifications. Prefabricated positions can be made from concrete culvert sections. The British Yarnold Bunker is made from sections of a concrete pipe.

Guard Towers provide increased field of view but a lower level of protection.

Dispersal and camouflage of assets can supplement fortifications against some forms of airfield attack.

Just as in colonial periods, comparatively obsolete fortifications are still used for low-intensity conflicts. Such fortifications range in size from small patrol bases or forward operating bases up to huge such as / in . Much like in the 18th and 19th century, because the enemy is not a powerful military force with the heavy weaponry required to destroy fortifications, walls of , or even simple mud can provide protection against small arms and anti-tank weapons – although such fortifications are still vulnerable to mortar and artillery fire.

Forts in modern American usage often refer to space set aside by governments for a permanent military facility; these often do not have any actual fortifications, and can have specializations (military barracks, administration, medical facilities, or intelligence).

However, there are some modern fortifications that are referred to as forts. These are typically small semi permanent fortifications. In urban combat they are built by upgrading existing structures such as houses or public buildings. In field warfare they are often log, sandbag or type construction.

Such forts are typically only used in low level conflict, such as counterinsurgency conflicts or very low level conventional conflicts, such as the Indonesia–Malaysia confrontation, which saw the use of log forts for use by forward and companies. The reason for this is that static above ground forts can not survive modern direct or indirect fire weapons larger than mortars, RPGs and small arms.

Prisons and others
Fortifications designed to keep the inhabitants of a facility in rather than attacker out can also be found, in , concentration camps, and other such facilities, with having some of the strongest of those. Those are covered in other articles, as most prisons and concentration camps are not primarily military forts (although forts, camps, and garrison towns have been used as prisons and/or concentration camps; such as , Guantanamo Bay detention camp and the Tower of London for example).

See also

Fort components

Types of forts and fortification

Fortification and siege warfare

Notable experts

  • Henri Alexis Brialmont
  • César Cui
  • Bernard de Gomme
  • Francesco Laparelli
  • Diades of Pella
  • James of Saint George
  • Menno van Coehoorn
  • Sébastien Le Prestre de Vauban
  • Maximilian von Welsch


  • July, Robert Pre-Colonial Africa, Charles Scribner, 1975
  • Murray, Nicholas. "The Development of Fortifications," The Encyclopedia of War, Gordon Martel (ed.). WileyBlackwell, 2011.
  • Murray, Nicholas. The Rocky Road to the Great War: The Evolution of Trench Warfare to 1914. Potomac Books Inc. (an imprint of the University of Nebraska Press), 2013.
  • Osadolor, Osarhieme Benson, "The Military System of Benin Kingdom 1440–1897", (UD), Hamburg University: 2001 copy
  • Thornton, John Kelly Warfare in Atlantic Africa, 1500–1800, Routledge: 1999

External links

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