Matters were in this position in the spring of 1816, when General Gaines was sent to fortify our frontier at the point where the Chattahoochee and Flint rivers unite to form the Appalachicola. In June of that year some stores for General Gaines's forces were sent by sea from New Orleans. The vessels carrying them were to go up the Appalachicola, and General Gaines was not sure that the little fleet would be permitted to pass the robbers' stronghold, which had come to be called the Negro Fort. Accordingly, he sent Colonel Clinch with a small force down the river, to render any assistance that might be necessary. On the way Colonel Clinch was joined by a band of Seminoles, who wanted to recapture the fort on their own account, and the two bodies determined to act together. Meantime the two schooners with supplies and the two gun-boats sent to guard them had arrived at the mouth of the river; and when the commandant tried to hold a conference with Garcon, the ship's boat, bearing a white flag, was fired upon. Running short of water while lying off the river's mouth, the officers of the fleet sent out a boat to procure a supply. This boat was armed with a swivel and muskets, and was commanded by Midshipman Luffborough. The boat went into the mouth of the river, and, seeing a negro on shore, Midshipman Luffborough landed to ask for fresh-water supplies. Garcon, with some of his men, lay in ambush at the spot, and while the officer talked with the negro the concealed men fired upon the boat, killing Luffborough and two of his men. One man got away by swimming, and was picked up by the fleet; two others were taken prisoners, and, as was afterwards learned, Garcon coated them with tar and burned them to death. It would not do to send more boats ashore, and so the little squadron lay together awaiting orders from Colonel Clinch. That officer, as he approached the fort, captured a negro, who wore a white man's scalp at his belt, and from him he learned of the massacre of Luffborough's party. There was no further occasion for doubt as to what was to be done. Colonel Clinch determined to reduce the fort at any cost, although the operation promised to be a very difficult one. Placing his men in line of battle, he sent a courier to the fleet, ordering the gun-boats to come up and help in the attack. The Seminoles made many demonstrations against the works, and the negroes replied with their cannon. Garcon had raised his flags--a red one and a British Union-jack--and whenever he caught sight of the Indians or the Americans, he shelled them vigorously with his 32-pounder.