After the St. Lawrence campaign had ended late the previous year with the British victory at the
Battle of Crysler's Farm, the defeated American Army under Major General
James Wilkinson went into winter quarters at
French Mills, New York, only just inside the United States. The British commanders feared that the Americans could threaten the British line of communication along the
St. Lawrence River from this position, but Wilkinson made no attempt to do so. His army arrived at French Mills with few supplies, and because of poor roads, lack of transport and draught animals and inefficiency of the Quartermaster General's Department, it was almost impossible to supply the army in this advanced position. Sickness rapidly increased until there were no less than 450 sick in squalid conditions in a hospital in
Malone, New York and many more in French Mills. s. The British defenders at Lacolle Mills included a Congreve rocket detachment from the
Royal Marines. Finally, in late January, Secretary of War
John Armstrong ordered Wilkinson to detach a division numbering 2,000 men under Brigadier General
Jacob Brown to
Sackett's Harbor, New York, and fall back with the main body (about 4,000 fit men) to
Plattsburgh, New York on
Lake Champlain, while the sick and wounded were removed to
Burlington, Vermont. British troops followed up almost to Plattsburgh, recovering large quantities of supplies from settlements in New York state such as
Malone and
Four Corners and paroling many sick American soldiers who fell into their hands, before withdrawing. American forces, under Major-General
Henry Dearborn, had
tried to capture the same post back in the fall of 1812. However, that attack had floundered in the face of poor organization and inexperience. ==Battle==