The theatre of war was to be much the same as in the French and Indian war (§ 14). The lines stretched from Nova Scotia to the Great Lakes, but settlement had extended so far westward that Detroit marked the flank of both powers, and Lake Erie was included in the field of operations. Like Braddock in 1755 (§ 16), the Americans expected to roll the enemy's line up from west to east; and at the same time they meant to penetrate where Loudon and Abercrombie had attacked, through Lake Ontario and Lake Champlain. For harbor and coast defence they relied chiefly on the fleet of gunboats. 111. WAR ON THE NORTHERN FRONTIER (1812, 1813). [Sidenote: Campaign of 1812.] For the beginning of the campaign two expeditions were planned,--one across the river from Detroit, the other across the Niagara from Buffalo. The experience of the Revolution threw little light on the problem of conveying large bodies of men, with the necessary stores, across such stretches of wild country. General Hull, in command at Detroit, after a single effort to invade Canada, was forced back, and on Aug. 16, 1812, was brought to a disgraceful capitulation. Fort Dearborn, now Chicago, and Mackinac were captured at about the same time. In October and November two attempts were made to cross the Niagara into Canada. Owing to the incapacity of the commanders, Van Rensselaer and Smythe, six thousand American troops were held in check, and smaller bodies of them defeated, by one thousand British. The military authorities in the centre waited for the reduction of western Canada before attempting to advance northward to Montreal. [Sidenote: Campaign of 1813.] The campaign of 1813 was little more fortunate. The British, with their savage allies, held Detroit; but a fresh-water navy had been constructed by both parties on Lake Erie, and the victory of Commodore Perry gave the control of Lake Erie, and thus of Detroit, to the Americans. On the Niagara frontier the Americans were successful in occupying the British forts on the western side of the river, but could not penetrate the country. A northern expedition descended the St. Lawrence, but was obliged to retire into American territory without result; and in the last days of the year the Niagara posts were again abandoned. 112. NAVAL WARFARE (1812-1815). [Sidenote: The first cruise.] [Sidenote: English cruisers captured.]