Armoured cavalry are military units using armoured fighting vehicles (AFVs) instead of horses. They began to replace horse cavalry in the heavy shock troops and the light reconnaissance, Skirmisher and Maneuver warfare roles in most armies commencing after the First World War. In that succeeding capacity, the obsolete name "cavalry" was retained.
Armoured cavalry, or simply Armoured warfare units, may be primarily equipped with heavy tanks or lighter and faster , armoured cars, or even in the case of what is often known as cavalry scout. Motorized or mechanized infantry may make up a portion of the unit in some countries, supported by either motorized or self-propelled artillery, with possibly Air assault troops on helicopters included.
Between the late 17th and mid-19th centuries, armoured cavalry referred to those cavalry regiments that retained the cuirass, and were commonly known as . After the First World War cavalry units were mostly converted from horses to either armoured cars or which became known as either mechanized cavalry fulfilling a reconnaissance role, or armoured cavalry serving in the offensive role that seeks to break through the enemy defences.
In October 1928, a new era began for the cavalry of the British Army when the 11th Hussars became the first regular cavalry regiment to "mechanize", to change from a horsed cavalry role to a mechanized one, re-equipping with armoured cars previously used by the Royal Tank Corps. Other regiments followed suit; in April 1939, the Royal Armoured Corps was formed to encompass the eighteen mechanized cavalry regiments of the line alongside the eight battalions of the Royal Tank Regiment, but did not include the Household Cavalry. The remaining two regular cavalry regiments were based in Palestine, and following the outbreak of war retained their horses until 1940 (the Royal Dragoon Guards) and 1941 (the Royal Scots Greys). Following mechanization, the few remaining distinctions of unit type became meaningless; cavalry regiments moved between the heavy and light armoured roles regardless of their names.
Armoured cavalry regiments operated in country for the Corps/Theater Commander, while the squadrons operated as the "eyes and ears" for the US Army Division Commanders. An Army brigade would only be authorized a cavalry troop, and not a whole cavalry squadron.
According to Army doctrine, the cavalry would find the enemy, and hold the enemy in place, until the heavy forces were brought up to deal with the located enemy. This process was known as the battle hand-off. At this point the cavalry is free to disengage and continue with other missions. Security missions could be rear guard, flank guard, or advance guard – the same functions as performed by infantrymen, only with tanks and ACAVs. With the infantry, the advance guard would be called the point man.
During the Vietnam War, it was the mission of armour (tanks) to close with the enemy and defeat them using firepower, manoeuvre, and shock action. With the US Infantry, the mission was the same, minus the shock power. Artillery's mission was to add firepower to the equation. The US Armored Cavalry's mission was to find the enemy and/or provide security for the Army, while having the means to destroy the enemy if becoming decisively engaged. In Vietnam, the US Army deployed 1 Armored Cavalry Regiment (containing 3 squadrons and an aviation squadron), 7 Armored Cavalry Squadrons, and 2 Armored Cavalry Troops:
From about January 1969 until the last mounted unit re-deployed from Vietnam in 1972 (air units remained in country), most armoured cavalry units (except the 11th ACR's tank companies) were equipped with the M551 Sheridan armored airborne reconnaissance assault vehicle (today, known to historians as a light tank).
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