On April 26, 1777, Sybil Ludington, aged 16, rode 40 miles in New York to warn her father's militia of the approach of the British. I would venture to say her ride was more effective and fruitful than Paul Revere's ride. A short excerpt from the article:
"She completed her mission around daybreak, covering nearly 40 miles—more than twice what Paul Revere had ridden—raising 400 men, and even fighting off a highway man with her father’s musket. The militia caught up with the retreating British and beat them back, too late to stop the attack, but not too late to make them pay dearly."