Simple past tense and past participle of outmarch.(verb)
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Use "outmarched" in a sentence
"The apprehended attack by Bragg never came, however, for in the race that was then going on between him and Buell on parallel roads, the Army of the Ohio outmarched the Confederates, its advance arriving at Louisville September 25."
"Did the Second have in it men who would see that it outmarched the First?"
"Harvey Hill had outmarched Jackson that day as if determined to seize the honors of battle from his senior."