At the beginning of April 1775, Daniel Boone and his trail crew began building Fort Boonesborough for defense, and after Richard Henderson and forty men arrived a few weeks later, he relocated it to higher ground. Like other frontier forts, it was intended as a refuge in case of attack, but construction progressed slowly as men worked briefly and then left to plant crops and build their own cabins, delaying completion as the perceived danger of Indian attacks faded. Historic drawings and residents' descriptions show that the fort was longer than it was wide, with blockhouses at each corner, shed-roof cabins inside, and a wall made from upright logs and the backs of the cabins enclosing it. Gates opened through each of the long walls, and near the center stood a double cabin and a well for water during siege. By early 1777, the fort was fully enclosed and two blockhouses had been built. After Daniel Boone escaped from the Shawnee and returned in June 1778, he found the fort in a bad state of defense, and residents quickly repaired the wall and built two more blockhouses out of fear of attack.