Leap-Frog - System of assault in which the first wave took the first objective and the second wave pass through them to take the second objective.
LG - Lewis gun.
Lifting Barrage - An advancing bombardment.
Light duty - Work suitable for a convalescing soldier.
Line - Associated with The Front e.g down the line.
L of C - Line of communication.
Listening Post - Position from which the enemy could be overheard, either in a forward trenches, or a temporary night-time post in No man's land.
Long Tom - Long barrelled artillery piece.
L Pip - Listening post.
Lucifer - a match. The name of a popular brand.
