Which left Joseph Warren to take over Adam’s leadership role in Boston. He became in charge with the organizing of militias and collecting weapons and gun powder. A while later when Adams and John Hancock came back to Massachusetts, they discovered that the British were in search of them to capture and kill them. It was Joseph Warren, who then informed the infamous Paul Revere and William Dawes to go give warning to them that British soldiers were coming to their secret sanctuary in Lexington to capture them (National Parks