25 cm Erdmörser
The 25 cm Erdmörser was a simple, mostly wooden mortar used for trench warfare fighting by the Imperial German Army in World War I. It consisted of a diameter filled with amonal and scraps of metal and a wooden bottom. Propellant consisted of a charge between that ignited a fuze by using glow plugs. These mortars weren't standardized, being a field expedient, and were given nicknames such as "barrel cannon" or "jam jar". They were soon supplanted by the Albrecht mortar.