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

Operated, moved, or controlled by fluid pressure, typically oil, used in mechanisms like recoil systems to absorb and manage energy.

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

A towed artillery carriage configuration where the gun is pulled directly behind the prime mover without a limber, relying on a single pole for connection.