The 23cm Petard is a British 230mm spigot mortar used solely as the main armament of the Churchill AVRE combat engineering vehicle. It fires an explosive charge the size of a grown child, nicknamed the "Flying Dustbin" with "good-enough" accuracy. Its great downside is that it has to be loaded from the exterior by the most dauntless (or novice) crewman.

23cm "Petard" Spigot Mortar
Mortar