Many volumes have been published telling of the events leading up to the Revolutionary War, as well as the fighting on the first day, April 19, 1775—some more fictitious than true. However, using primary accounts, extant arms, archaeological finds and by studying the battle damage left behind, today we have a much better understanding of what happened, along with the types of firearms that were being used by the men who fought on that pivotal day. On the night of April 18, 1775, about 750 British regulars began a march from Boston, Mass., to Concord, a town about 18 miles...