French pneumatic mortar WW1. Instead of using explosive propellants to launch the mortar round, compressed gas heaved the shell skyward. A series of mortars, ranging from 60mm to 120mm were put into service during the stalemate trench warfare that marked the First World War, were designed by Edgar Brandt.
GI carrying containers with 60-mm mortar shells for the M2 mortar. The M2 saw universal deployment during WW2; it remained in service through Vietnam.The M2 attempted to bridge the gap between the 81 mm mortar and the hand grenade. Its shells included HE, white phosphorus, and illuminating. Note that unlike the German practice of carrying mortar shells in metal containers, the US employed the much more flexible system of individual casing.