Northern theater · 1775
Canadian Campaign
The Continental invasion of Canada combined Montgomery’s advance up the Richelieu with Arnold’s difficult march through Maine, failed at Quebec, and ended in a retreat toward Lake Champlain.
Operational geography
Campaign Movement Map
A proportional campaign overview using each battle record’s modern reference coordinate. It explains operational movement; it is not a surveyed reconstruction of 1776 unit positions.
- Battle of QuebecBritish victory
- Battle of Trois-RivièresBritish victory
Campaign sequence
Where This Battle Fits in Its Campaign
Campaign Engagements
December 31, 1775
Battle of Quebec
British victory
June 8, 1776
Battle of Trois-Rivières
British victory
Why Congress approved an invasion of Canada
American leaders feared that Canada could become a base for a British move south while also hoping French-speaking inhabitants might support resistance to Britain. The resulting strategy tried to seize key points before the Crown could fully mobilize the province. That ambition produced a two-pronged advance whose geographic scale was far greater than the young Continental military system was prepared to sustain.
Evidence basis: U.S. Army CMH — The Canadian Campaign, 1775–1776
Montgomery and Arnold approached the same objective through different logistical worlds
Montgomery moved through the Lake Champlain and Richelieu corridor, besieging St. Johns and occupying Montreal. Arnold marched through the Maine wilderness toward Quebec. Each route imposed different costs, and neither column arrived at Quebec with the strength imagined at the start. Bellum’s campaign map keeps the routes separate until convergence so losses and delays are not hidden inside one smooth arrow.
Evidence basis: U.S. Army CMH — The Canadian Campaign, 1775–1776
The failed assault changed the campaign from conquest to endurance
Quebec remained in British hands after December 31, 1775. The Americans could maintain pressure outside the city, but the failed attack removed leaders and men at a moment when enlistments and disease were already serious problems. The initiative gradually passed to the defenders as they waited for reinforcement.
Evidence basis: U.S. Army CMH — The Canadian Campaign, 1775–1776
Smallpox and supply failure were strategic weapons without commanders
The Canadian expedition illustrates why battle-only histories can mislead. Men became unavailable through sickness, hunger, exhaustion and desertion long before a British musket or cannon reached them. Those losses reduced the army that could fight, guard prisoners, move supplies or hold captured towns. Bellum therefore places health and logistics alongside tactical phases in the campaign view.
Evidence basis: U.S. Army CMH — The Canadian Campaign, 1775–1776
British reinforcement converted a stalled defense into a counteroffensive
When reinforcements arrived in 1776, the balance changed rapidly. The Americans abandoned the siege, fought at Trois-Rivières during retreat, and continued south. The campaign’s geography reversed direction: routes once used for invasion became escape corridors toward Lake Champlain.
Evidence basis: U.S. Army CMH — The Canadian Campaign, 1775–1776
The failed invasion produced the fleet that fought at Valcour Island
Retreat did not end the northern problem. Britain now threatened to continue south through Lake Champlain. Arnold and others responded by constructing an inland fleet to delay that movement. The Canadian Campaign therefore feeds directly into the Lake Champlain campaign, where shipbuilding and season replaced city siege as the dominant operational variables.
Evidence basis: U.S. Army CMH — The Canadian Campaign, 1775–1776
Frequently Asked Questions
Why did the Americans invade Canada in 1775?
American leaders hoped to remove a British base to the north, gain support in Canada, and reduce the threat to the Hudson–Lake Champlain corridor.
Source basis: U.S. Army CMH — The Canadian Campaign, 1775–1776
Why did the assault on Quebec fail?
The attack combined difficult weather, divided columns, strong defenses, leadership losses, and the failure to secure a quick breakthrough.
Source basis: U.S. Army CMH — The Canadian Campaign, 1775–1776
What happened after Quebec?
The American force maintained pressure for a time but eventually withdrew from Canada as British strength increased.
Source basis: U.S. Army CMH — The Canadian Campaign, 1775–1776
Why was Valcour Island important after the retreat?
Arnold’s lake fleet could not permanently stop the British advance, but the fighting and retreat consumed time in the 1776 campaign season.
Source basis: U.S. Army CMH — The Canadian Campaign, 1775–1776