In September 1813 the USA invaded Lower Canada with the intention of capturing Montreal, thus cutting the lines of supply to British troops in Upper Canada. See this website for a map of the theatre of operations.
Two US armies took part in the invasion. One, commanded by General Wade Hampton, was to move from Plattsburgh along the River Chateuaguay, whilst the other, under General James Wilkinson, was to advance from Sackett’s Harbor along the River St Lawrence. The two were to unite at Montreal, but co-operation between them was hampered by a long running feud between the two US generals.
On 6 November Wilkinson learnt that Hampton’s army had been defeated by a Canadian force in the Battle of the Chateuaguay on 26 October. Wilkinson sent a messenger ordering Hampton to march west and rendezvous with him at Cornwall in Eastern Ontario. However, Hampton was retreating towards winter quarters at Plattsburgh.
Wilkinson’s 8,000 men were being followed and harried by a 1,200 man corps of observation as it sailed down the St Lawrence. It was commanded by Lieutenant-Colonel Joseph Wanton Morrison, a British officer who had been born in New York when it was still under British control towards the end of the American War of Independence. The main British force was at their naval base of Kingston, which they assumed was Lawrence’s objective.
Morrison’s troops consisted of a mixture of British regulars from the 49th and his own 89th Regiments of Foot, three Royal artillery guns and crews, Canadian Fencibles, Canadian Voltigeurs, Tyendinaga and Mississauga Mohawk warriors and the Dundas County Militia. They were supported by a flotilla of gunboats commanded by William Howe Mulcaster. Two-thirds of the 270 Canadian regulars were French speakers.
On 10 November a skirmish was fought at Hoople’s Creek. The next day Wilkinson decided that he needed to chase Morrison away before crossing the Long Sault Rapids. He was ill and his second in command, Major-General Morgan Lewis was unavailable, so Brigadier-General John Parker Boyd was put in command.
The Anglo-Canadians headquarters was at Crysler’s Farm, sometimes mis-spelt Chrysler’s Farm. Morrison was able to fight on ground of his choosing . Woods and two ravines enabled his men to take up concealed positions , but the Americans were moving across an open battlefield that exposed them to the accurate fire of the Anglo-Canadians
On 11 November the Americans were slow to attack, used only 4,000 of their troops and committed them piecemeal. They lost 102 killed, 237 wounded and 120 captured. Anglo-Canadian casualties were 31 killed, 148 wounded and 13 missing. About a third of the Fencibles, half of whom were French-Canadians, became casualties.
The American attack was called off after three hours. Their men were tired and hungry, and they had fewer experienced officers than their opponents. Despite the defeat Wilkinson ordered his army to cross the Long Sault rapids. However, the next day he received a message informing him that Hampton would not make their planned rendezvous, as he had retreated to winter quarters. Wilkinson therefore ordered his army to retire to winter quarters at French Mills.
As well as ending the US 1813 invasion, the battle is very important in Canadian history because it was a victory won by a mixture of British, English-speaking Canadians, French-Canadians and Mohawks.
The following websites were used in researching this post, in addition to those linked in the text:
Canadian Military History Gateway.
War and Security 
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