Less than three weeks after Daniel Boone arrived here in April 1775, the battles of Lexington and Concord ignited the American Revolution. For two years an uneasy peace held on the frontier, but in early 1777 the British and their Native American allies began attacking frontier settlements. In March, two men were killed outside Fort Boonesborough. On April 24, when only twenty-two riflemen were in the fort, a large group of Indians, between 50 and 100, used a ruse to draw a party out and attacked them, killing one man and wounding four, including Boone. Simon Kenton rushed from the fort into the fight, killed one or more of Boone's attackers, and dragged Boone to safety. A month later, twenty-one men held the fort against 200 Indians during a three-day siege. In February 1778, Shawnees captured Boone and thirty others from Boonesborough while they were collecting salt at Blue Licks. During his captivity, Boone learned of plans to attack Fort Boonesborough, and his escape that June allowed the fort to prepare. In September, British and Canadian soldiers and 400 warriors led by Chief Blackfish besieged Boonesborough for nine days, but the fort's men, women, and children fought off repeated attacks. The successful defense of Fort Boonesborough helped save the western frontier from British expansion.