Glossary of Defined Terms

Petard

Adapted From L'Encyclopedie Diderot et D'Alembert. Fortification. Plate VIII.A prepared charge of powder that could be attached to a barrier, door, or other obstacle and detonated to destroy the obstacle. Petards could be arranged in any number ways using a wide range of powder vessels and attachment methods ranging from complicate fixtures involving brass pots, boards, and hooks to simple canvass bags with a powder hose. The illustration (right) shows front and rear views of a hook petard. This type of petard was applied to wooden doorways; the powder vessel was fixed to the board with leather straps and the board fixed to a doorway with the hook. A fuze at the top rear of the powder vessel would be touched off and the poor man detailed to handle the job would run like mad to the nearest cover. If all went well and the powder vessel didn't fly off backward away from the door a hole would be blasted through the board and doorway, or even better, the force of the explosion would be transmitted evenly to the board, the board would be propelled forward, and the door would be knocked right down off its hinges.

January, 2003