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was a World War II [[German|Nazi Germany]] [[assault gun]] built on the [[Tiger I]] chassis and armed with a 380mm rocket-propelled mortar. The official German designation was '''Sturmmörserwagen 606/4 mit 38 cm RW 61'''. Its primary task was to provide heavy fire support for infantry units [[fighting in urban areas|urban warfare]]. The few vehicles produced fought in the [[Warsaw Uprising]], the Battle of the Bulge and the Battle of the Reichswald. The fighting vehicle was known by various informal names, among which the Sturmtiger became the most popular.
While greatly improved compared to the earlier models, by this time infantry anti-tank weapons were improving dramatically, and the Wehrmacht still saw a need for a similar, but more heavily armoured and armed vehicle. Therefore, a decision was made to create a new vehicle based on the Tiger tank and arm it with a 210 mm howitzer. However, this weapon turned out not to be available at the time and was therefore replaced by a 380 mm rocket launcher, which was adapted from a Kriegsmarine depth charge launcher.
In September 1943 plans were made for Krupp to fabricate new Tiger I armoured hulls for the Sturmtiger. The Tiger I hulls were to be sent to Henschel for chassis assembly and then to Alkett where the superstructures would be mounted. The first prototype was ready and presented to Adolf Hitler in October 1943. Delivery of the first hulls would occur in December 1943, with the first three Sturmtiger completed by Alkett by 20 February 1944.
Due to delays, Hitler did not request production of the weapon until 19 April 1944; twelve superstructures and weapons would be prepared and mounted on rebuilt Tiger I chassis. The first three production series Sturmtiger were completed by Alkett in August 1944. Plans to complete an additional seven from 15 to 21 September 1944 were presented to Hitler in a conference on 18–20 August 1944. Ten Sturmtiger were produced in September, along with an additional five in December 1944.Jentz 1999
Hitler had laid great importance on the special employment of the Sturmtiger and believed it would be necessary to produce at least 300 rounds of ammunition per month.
Compared to the Tiger tank, the Sturmtiger was much shorter overall, only compared to the Tiger's , due largely to the fact that it did not have the long main gun of the latter which protruded far in front of the hull. It also was slightly lower than the Tiger at compared to .
| 150 mm | superstructure front | 47° |
| 150 mm ( 100 mm) | hull front (without the additional plate) | 25° |
| 82 mm | superstructure side and rear upper hull side and rear | 20° none |
| 70 mm | hull front top | 80° |
| 62 mm | lower hull front | 65° |
| 62 mm | lower hull side lower hull rear | none 48° |
| 28 mm | hull floor | |
The design of the rocket system caused some problems. The hot rocket exhaust could not be vented into the fighting compartment nor could the barrel withstand the pressure if the gasses were not vented. Therefore, a ring of ventilation shafts was put around the barrel which channeled the exhaust and gave the weapon something of a pepperbox appearance.
Due to the bulkiness of the ammunition, only fourteen rounds could be carried internally, of which one was already loaded, with another in the loading tray. The rest were carried in two storage racks. To help with the loading of ammunition into the vehicle, a loading crane was fitted at the rear of the superstructure next to the loading hatch. Even then, the entire five-man crew had to help with the loading.
It was intended that each Sturmtiger would be accompanied by an ammunition carrier built on the same Tiger I chassis, but only one carrier was completed.
Located at the rear of the loading hatch was a Nahverteidigungswaffe launcher which was used for close defence against infantry in addition to a frontal mounted 7.92 mm MG 34 machine gun.
Three new Panzer companies were raised to operate the Sturmtiger: Panzer Sturmmörser Kompanien (PzStuMrKp) ("Armored Assault Mortar Company") 1000, 1001 and 1002. These originally were supposed to be equipped with fourteen vehicles, but this figure was later reduced to four each, divided into two platoons.
PzStuMrKp 1000 was raised on 13 August 1944 and fought during the Warsaw Uprising with two vehicles, as did the prototype in a separate action, which may have been the only time the Sturmtiger was used in its intended role. PzStuMrKp 1001 (commanded by Captain von Gottberg) and 1002 (commanded by Lieutenant Zippel) followed in September and October. Both PzStuMrKp 1000 and 1001 served during the Ardennes Offensive, with a total of seven Sturmtiger.
After this offensive, the Sturmtiger were used in the defence of Germany, mainly on the Western Front.
During the battle for the bridge at Remagen, German forces mobilized Sturmmörserkompanie 1000 and 1001 (a total of 7 units) to take part in the battle. The Sturmtiger were originally tasked with using their mortars against the bridge itself, though it was discovered that they lacked the accuracy needed to hit the bridge. During this action, one of the Sturmtigers in Sturmmörserkompanie 1001 near Düren and Euskirchen allegedly hit a group of stationary Sherman tanks in a village with a 380mm round, resulting in nearly all the Shermans being put out of action, and their crews killed or wounded. This is the only tank-on-tank combat a Sturmtiger is ever recorded engaging in.Kleine, E. and Kühn, V. "Tiger: the History of a Legendary Weapon", 1942-45. p.245Schnieder, Wolfgang, "Elefant Jagdtiger Sturmtiger: Rarities of the Tiger Family" Schiffler Military History September 1990, p45
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