Usages of fossa
Milites vallum et fossam circum castra muniunt, dum dux in turri stat.
The soldiers fortify the rampart and the ditch around the camp, while the general stands in the tower.
Prima vigilia milites vallum iterum muniunt et aquam e fossa tollunt.
At the first watch the soldiers fortify the rampart again and remove water from the ditch.
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