Sentence:  As for the state of Antwerp, the enemy has fortified so strongly that their ships cannot possibly remove him; for he bends half his force to defend the <WSD>scance</WSD> of Calloo, upon the Fladers' side of the bridge, and the other half on the brabant side, which is full of <WSD>scances</WSD>, so that one hundred men can defend it from five hundred. 
Meaning of the word marked with <WSD> tags:  A crescent-shaped structure of stones built to afford cover in battle.