Sapper (noun)

1. A soldier who digs trenches, tunnels, and mines, especially in siege warfare.
2. A military engineering specialist who is trained in the construction and demolition of fortifications and obstacles.

Origin:

From french sappe ("spade, trench"), from old french sappe, from saper ("to undermine, excavate"), from latin sapere ("to taste, to have a good taste").

Examples:

1. The sappers were responsible for digging the trenches and tunnels for the troops.
2. The sappers used explosives to destroy the enemy fortifications.
3. The sapper's job is to build, maintain, and repair fortifications, obstacles, and defensive systems.
4. The sapper's also have a role in reconnaissance, mine clearance, and counter-mobility operations.
5. The sappers are an important part of the military engineering corps.