French Hotchkiss-Brandt mortar

The French Hotchkiss-Brandt is a type of mortar that utilizes a rifled barrel for improved accuracy. Unlike smooth-bored mortars, the Hotchkiss-Brandt features a rifled barrel and a bomb with a pre-rifled copper driving band. This band expands under gas pressure when the bomb is fired, engaging the grooves in the barrel to impart spin and stabilize the projectile in flight. This design enhances both the accuracy and the sealing of propellant gases compared to earlier mortar designs. Mortars, in general, saw a resurgence in importance during World War I, providing a short-range, high-trajectory weapon capable of dropping bombs into enemy trenches.1