The ordnance inventory designation was Sd. Kfz. 186. The Jagdtiger was the heaviest armored fighting vehicle operationally used during World War II. The vehicle carried a 128 mm PaK 44 L/55 main gun, capable of out-ranging and defeating any fielded Allied tank.
It saw service in small numbers from late 1944 to the end of the war on both the Western and Eastern Front. Tiger ace Otto Carius commanded a company of Jagdtigers. His post-war memoir provides a rare combat history of the Jagdtigers which had been under his command.
Although 150 were ordered, only between 77 to 88 were produced. Due to an excessive weight the Jagdtiger was continuously plagued with mechanical problems.
Otto Carius recorded that a 128 mm projectile went through all the walls of a house and destroyed an American tank behind it.