Gracias Gale :D
Aunque la verdad no los ponen muy bien como unidad prácticamente dicen que sólo sirven para perseguir a los enemigos que huyen... o al menos eso es lo que he entendido.

Fougasse
This defensive weapon is a landmine constructed by military engineers and fired by the defenders lighting a fuse.
A fougasse consists of a pit, sometimes dug at an angle, with gunpowder packed into the bottom and suitably wrapped to keep it dry. The hole is then backfilled with rubble and stones, taking care not to break the fuse, creating a huge “canister shot” weapon. Any enemies caught by the explosion are blown to smithereens by the blast. Damp, of course, will cause the fougasse to misfire, like any other gunpowder weapon.

Historically, a later and nastier, refinement used a flintlock mechanism to fire the charge. As well as making the explosion more reliable, this allowed military engineers to turn the fougasse into a booby trap. A piece of twine tied to the trigger acted as a tripwire: an unfortunate booby then stumbled and fired the device into himself and his nearby comrades.

During the 20th Century, the fougasse was refined into a flamethrower by burying oil drums on top of the explosives. And at the time of writing, the fougasse remains in use, as only one of the IEDs (improvised explosive device) used by insurgents against occupying forces in Iraq.