OTD in 1775 Paul Revere began his midnight ride

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Between 9 and 10 p.m. on the night of April 18, 1775, Joseph Warren told Revere and William Dawes that the king's troops were about to embark in boats from Boston bound for Cambridge and the road to Lexington and Concord. Warren's intelligence suggested that the most likely objectives of the regulars' movements later that night would be the capture of Adams and Hancock. They did not worry about the possibility of regulars marching to Concord, since the supplies at Concord were safe, but they did think their leaders in Lexington were unaware of the potential danger that night. Revere and Dawes were sent out to warn them and to alert colonial militias in nearby towns.[40][41]

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Riding through present-day Somerville, Medford, and Arlington, Revere warned patriots along his route, many of whom set out on horseback to deliver warnings of their own. By the end of the night there were probably as many as 40 riders throughout Middlesex County carrying the news of the army's advance. Revere did not shout the phrase later attributed to him ("The British are coming!"): his mission depended on secrecy, the countryside was filled with British army patrols, and most of the Massachusetts colonists (who were predominantly English in ethnic origin)[44] still considered themselves British.[45][46] Revere's warning, according to eyewitness accounts of the ride and Revere's own descriptions, was "The Regulars are coming out."[47] Revere arrived in Lexington around midnight, with Dawes arriving about a half-hour later. They met with Samuel Adams and John Hancock, who were spending the night with Hancock's relatives (in what is now called the Hancock–Clarke House), and they spent a great deal of time discussing plans of action upon receiving the news. They believed that the forces leaving the city were too large for the sole task of arresting two men and that Concord was the main target.[48] The Lexington men dispatched riders to the surrounding towns, and Revere and Dawes continued along the road to Concord accompanied by Samuel Prescott, a doctor who happened to be in Lexington "returning from a lady friend's house at the awkward hour of 1 a.m."[41][49]

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The ride of the three men triggered a flexible system of "alarm and muster" that had been carefully developed months before, in reaction to the colonists' impotent response to the Powder Alarm of September 1774. This system was an improved version of an old network of widespread notification and fast deployment of local militia forces in times of emergency. The colonists had periodically used this system all the way back to the early years of Indian wars in the colony, before it fell into disuse in the French and Indian War. In addition to other express riders delivering messages, bells, drums, alarm guns, bonfires, and a trumpet were used for rapid communication from town to town, notifying the rebels in dozens of eastern Massachusetts villages that they should muster their militias because the regulars in numbers greater than 500 were leaving Boston with possible hostile intentions. This system was so effective that people in towns 25 miles (40 km) from Boston were aware of the army's movements while they were still unloading boats in Cambridge.[54] Unlike in the Powder Alarm, the alarm raised by the three riders successfully allowed the militia to confront the British troops in Concord, and then harry them all the way back to Boston.[55]

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