Paul Revere’s famous ride began tonight, April 18, 1775. The “Two if by Sea” lanterns confirmed what he had already learned: that the British troops would cross the Charles River in boats, landing in Cambridge and marching to Concord the next day. Revere crossed the river and road his horse towards Lexington. At the same time, William Dawes road another horse “by land”, via Watertown, to Lexington and Concord. On the following day – the 19th – Patriots and British soldiers clashed at both Lexington and at Concord.