Mines

Traps cannot attack
Miners had the crucial role of tunneling under no man’s land and planting explosives under enemy strongholds that were too heavily defended for infantry to attack. These specialists were often recruited from coal mining towns in Britain, Wales, and Canada. With the looming threat of caving in, counter mining, and tunnel fights, these “clay kickers” had an extremely low mortality rate
"Your biggest fear would be that if you were detected, the enemy would lay a charge. If you