The impact of the Minutemen during the Revolutionary War is best summarized by their role in fighting the British at Lexington and Concord and their ability to prepare for battle quickly. The Minutemen were colonial militia members who were trained to be ready at a moment's notice, which allowed them to respond swiftly to British movements. Their engagement at the battles of Lexington and Concord in April 1775 marked the beginning of open conflict between the colonies and Britain.
While they did employ tactics that were effective against British forces—such as guerrilla-style warfare—their primary significance was in their rapid mobilization and participation in these early battles. They did not play a major role in providing financial support as wealthy farmers; rather, their contribution was primarily military.
In summary, the most accurate answer would be that they fought the British at Lexington and Concord and could prepare for battle quickly.