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Use "breastworks" in a sentence
"But if you know the trail through the paddies, you can walk among the weeds, cross the shallow dip which was a moat, pass by lumps of rain-pressed earth once called breastworks and stand on a flat place so hard packed the grass does not grow."
"In front of the breastworks was another chain -- a wider and thicker one."
"It was absolutely necessary to get time in which to throw up some kind of breastworks or defenses for the city, and he at once resolved on a night attack against the British."