sheltered trench
Military term for a trench that provides cover for soldiers, especially when firing from a prone position.
The soldiers took cover in the sheltered trench.
Compound of 伏射 (ふくしゃ, 'firing from a prone position') and 濠 (ごう, 'moat' or 'trench'). The exact historical origin is uncertain, but it is a specialized military term.