Answer: blockhouse

AnswerCrossword Clue
BLOCKHOUSEPioneer fort
BLOCKHOUSEFortification
BLOCKHOUSEStronghold reinforced against enemy fire
blockhousea wooden or concrete fortification with ports or loopholes for defensive fire, observation, etc
blockhouseA house made of squared logs
blockhouseA one-storied timber building with loopholes, used as a fort
blockhouseA reinforced concrete shelter used as an observation point