Having made the necessary arrangements on the 30th of June, Burgoyne advanced cautiously on both sides of the narrow channel which connects Lakes Champlain and George, the British on the west and the German mercenaries on the east, with the naval force in the center, forming a communication between the two divisions of the army, and on the 1st of July his van appeared in sight of Ticonderoga. The river Sorel issues from the north end of Lake Champlain and throws its superfluous waters into the St. Lawrence. Lake Champlain is about eighty miles long from north to south, and about fourteen miles broad where it is widest. Crown Point stands at what may properly be considered the south end of the lake, although a narrow channel, which retains the name of the lake, proceeds southward and forms a communication with South river and the waters of Lake George. Ticonderoga is on the west side of the narrow channel, twelve miles south from Crown Point. It is a rocky angle of land, washed on three sides by the water and partly covered on the fourth side by a deep morass. On the space on the northwest quarter, between the morass and the channel, the French had formerly constructed lines of fortification, which still remained, and those lines the Americans had strengthened by additional works. Opposite Ticonderoga on the east side of the channel, which is here between three and four hundred yards wide, stands a high circular hill called Mount Independence, which had been occupied by the Americans when they abandoned Crown Point, and carefully fortified. On the top of it, which is flat, they had erected a fort and provided it sufficiently with artillery. Near the foot of the mountain, which extends to the water's edge, they had raised entrenchments and mounted them with heavy guns, and had covered those lower works by a battery about half way up the hill. With prodigious labor they had constructed a communication between those two posts by means of a wooden bridge which was supported by twenty-two strong wooden pillars placed at nearly equal distances from each other. The spaces between the pillars were filled up by separate floats, strongly fastened to each other and to the pillars by chains and rivets. The bridge was twelve feet wide and the side of it next Lake Champlain was defended by a boom formed of large pieces of timber, bolted and bound together by double iron chains an inch and a half thick. Thus an easy communication was established between Ticonderoga and Mount Independence and the passage of vessels up the strait prevented.