Chemise (wall)

In military architecture, a chemise is a low wall, often loopholed or crenellated, surrounding the main structure of a castle or fortification. It serves as an additional layer of defense, forcing attackers to overcome the chemise before directly assaulting the keep or main wall. This creates a killing zone between the chemise and the inner wall, where defenders can concentrate fire.

The chemise is typically lower in height than the main wall it protects. This allows defenders positioned on the main wall to fire over and around the chemise, providing a clear field of fire against approaching enemies.

The primary purpose of a chemise is to delay the enemy's advance, providing more time for defenders to prepare and inflict casualties. It also makes scaling the main walls more difficult, as attackers must first overcome the obstacle of the chemise and the defenders positioned behind it. Chemises are often found in conjunction with other defensive features like moats, towers, and gatehouses.