caponier
/ˌkæpəˈnɪr/
noun
- A covered passage or trench, typically in a fortification, that allows defenders to move safely and fire at attackers from protected positions.
- Visitors to the old fort can walk through the stone caponier that once protected the garrison.
- The soldiers used the caponier to cross the moat without being seen by the enemy.
- The castle's caponier was built with narrow slits for archers to shoot through.