High Explosive (HE) round: an artillery or mortar projectile containing explosive filler designed to inflict damage through blast and fragmentation effects.

A breech mechanism in artillery where the screw threads are interrupted to allow quick opening and closing of the breech.

Method of transporting artillery by mounting it on a railway flatcar for movement along rail lines.

A recoil system where the gun barrel slides backward within the cradle during firing, absorbing recoil energy before returning to battery.