When the British approached, the Concord Militia didn't know about the skirmish at this place earlier that day
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which is that the British fired first and that the militia didn't fire at the... [DOC] [TLE] Battles of Lexington and Concord - Wikipedia [PAR] These early warnings played a crucial role in assembling a sufficient number of 
colonial militia to inflict heavy damage on the British regulars later in the day.