The siege of Boonesborough was a military engagement which took place in September 1778 during the American Revolutionary War. On September 7, Shawnee chief Blackfish, who was allied to the British, led an attack on the Kentucky settlement of Boonesborough. Months before the battle, Blackfish had captured and adopted Daniel Boone, the founder of Boonesborough. Boone escaped the Shawnees in time to lead the defense of the settlement. Blackfish's siege was unsuccessful and was lifted after eleven days. Boone was then court-martialed by fellow officers who suspected him of harboring Loyalist sympathies. He was acquitted, but soon left the settlement.