The Red Badge of Courage
what was a particular role of what a skirmisher was in battle
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These were men who fought in battle. In this case, these were the men who fought on foot. Skirmishers were often members of the cavalry.
"Spread over the grass and in among the tree trunks, he could see knots and waving lines of skirmishers who were running hither and thither and firing at the landscape."
The Red Badge of Courage