On the opposite bank he soon got ready a fleet horse. There he stood, bridle in hand, watching to catch sight of the signal lights. At eleven o'clock two lights gleamed out from the belfry, and told him that the British troops were crossing the Charles River on their march through Cambridge.
Leaping into his saddle he sped like the wind toward Lexington. Suddenly two British officers sprang out to capture him; but quickly turning his horse, he dashed into a side path, and soon outdistanced his pursuers. Ten minutes later he arrived at Medford.
Then at every house along the road, he stopped and shouted, "Up and arm! Up and arm! The regulars are out! The regulars are out!"