American Military History, Volume 1 by Richard W. Stewart

The fundamental military strategy of the United States was simple enough. The primary undertaking would be the conquest of Canada. The United States also planned an immediate naval offensive, whereby a swarm of privateers and the small Navy would be set loose on the high seas to destroy British commerce. The old invasion route into Canada by way of Lake Champlain and the Richelieu River led directly to the most populous and most important part of the enemy's territory. The capture of Montreal would cut the line of communications upon which the British defense of Upper Canada depended, making the fall of that province inevitable. But this invasion route was near the center of disaffection in the United States from which little local support could be expected. The places where enthusiasm for the war ran high and where the Canadian forces were weak offered a safer theater of operations, though one with fewer strategic opportunities. Thus, in violation of the principles of objective and economy of force, the fi rst assaults were delivered across the Detroit River and across the Niagara River between Lake Erie and Lake Ontario rather than along the Hudson–Lake Champlain–Montreal line of advance.

The war progressed through three distinct stages. In the fi rst, lasting until the spring of 1813, England was so hard pressed in Europe that it could spare neither men nor ships in any great number for the conflict in North America. The United States was free to take the initiative, to invade Canada, and to send out cruisers and privateers against enemy shipping. During the second stage, lasting from early 1813 to the beginning of 1814, Britain was able to establish a tight blockade but still could not materially reinforce the troops in Canada. During this stage the American Army, having gained experience, won its first successes. The third stage, in 1814, was marked by the constant arrival in North America of British regulars and naval reinforcements, which enabled the enemy to raid the North American coast almost at will and to take the offensive in several quarters. At the same time, in this final stage of the war American forces fought their best fights and won their most brilliant victories.