On 18 April 1775, the Assassin Ratonhnhaké:ton met with Paul Revere, who was already meeting with Newman and William Dawes. Newman had agreed to warn Revere about an impending attack by the British Army on Lexington and Concord; he would put two lanterns on the church steeple if the attack was by sea.
After sneaking out of his house that night, he met with John Pulling and Thomas Bernard, and the three went about setting up the lanterns. They were seen, and Revere was able to rally Continental troops to defend the two towns.
Newman was later questioned about his actions that night, but he was able to talk his way out of rest and soon fled Boston.