The "Revolutionary men in brown clothing" likely refers to the militias and soldiers who fought for the American Patriots during the Revolutionary War. These individuals often dressed in simpler and more practical clothing, which included brown or earth-toned garments, unlike the uniformed troops of the British Army.
One prominent group associated with such attire are the "Minutemen," who were local militia members ready to respond quickly to threats. The term "Minuteman" originates from their readiness to mobilize at a minute's notice. They played a significant role in early battles of the war, including the Battles of Lexington and Concord in 1775.
Throughout the Revolutionary War, various local militias made up of farmers, tradesmen, and ordinary citizens fought alongside Continental Army regulars, contributing significantly to the efforts for American independence. These men were integral to the strategy of guerrilla warfare employed by the Patriots against the British forces.