Fort Boonesborough was a frontier fort in Kentucky, founded by Daniel Boone and his men following their crossing of the Kentucky River on April 1, 1775. The settlement they founded, known as Boonesborough, Kentucky, is Kentucky's second oldest European-American settlement. The fort was the scene of much action during the western theater of the American Revolutionary War. In September 1778, the fort withstood an attack by American Indians in what would later be called "The Great Siege".