Your mortar barrage will put exactly one round on the intended target. That round will be a dud. The mortar team will always have the correct number of safety pins to prove they armed all the rounds. To ensure this, the mortar team carries extra pins. There is no such thing as a convenient fighting hole.
Odd objects attract fire.
You are odd. More aircraft are incapacitated by a shortage of spare parts than by enemy action. 2 Beers X 12 Grunts equals 49 Cases.