The Panzerfaust is an inexpensive, single shot, recoilless German anti-tank weapon of WWII. The weapon, when correctly fired from the crook of the arm, could with its shaped charge warhead penetrate the armour of any armoured fighting vehicle of the period.
The Faustpatrone was much smaller in physical appearance than the better known Panzerfaust. Development of the Faustpatrone started in the summer of 1942 at the German company HASAG with the development of a smaller prototype called Gretchen ("little Greta") by a team headed by Dr. Heinrich Langweiler in Leipzig. The basic concept was that of a recoilless gun; neither the Faustpatrone, nor its successor the Panzerfaust were rockets, because the round design, like those fired by grenade launchers, did not feature a sustainer rocket motor that ignited after it left the launcher.