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In Upper Canada the newly appointed administrator, Isaac Brock, had less success raising a militia because of the strong American element in the province. Prevost recognized, however, that, since troops could only be moved and supplied speedily by water, any numerical deficiency in land forces would initially be offset by the superiority of the British Provincial Marine over the Americans on the Great Lakes. His strategy, in line with instructions from London, was defensive, the key being to safeguard Quebec, the only permanent fortress in the Canadas. If the Americans launched a substantial, well-organized invasion, Prevost would have no choice but to fall back on Quebec and try to hold it until reinforcements arrived from overseas. Predatory, ill-concerted incursions by the enemy might be repulsed, provided limited resources were not squandered, but Prevost ruled out major offensive operations as imprudent. Initially, too, he wanted to avoid any provocative action, which might unite a divided American public behind the war. Once hostilities started in June 1812, Brock, although momentarily restraining a natural impulse to go to the offence, found this defensive stance irksome. That summer the initiatives taken by Captain Charles Roberts in capturing Fort Michilimackinac (Mackinac Island, Mich.) and by Brock in taking Detroit, gave an unexpected fillip to the morale of Upper Canadians and revealed American unpreparedness.
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