fougade

from The Century Dictionary.

• noun Milit., a little mine in the form of a well, 8 or 10 feet wide and 10 or 12 deep, charged with sacks of powder, or powder and shells, and covered with stones or earth.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Mil.) A small mine, in the form of a well sunk from the surface of the ground, charged with explosive and projectiles. It is made in a position likely to be occupied by the enemy.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun military, historical A kind of land mine; a fougasse.