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 In 
June 1812, the United States declared 
war on Britain, already locked in combat 
with Napoleon’s France. The resulting 
War of 1812 was fought largely on Canadian 
territory, especially along the Niagara 
frontier. 
The 
Americans were superior in numbers but 
badly organized. First Peoples, including 
a Shawnee contingent led by Tecumseh, 
and Canadian militia units provided invaluable 
support to Canada’s garrison of 
professional soldiers. In October 1812, 
Sir Isaac Brock, commander-in- chief 
of Upper Canada, was killed defeating 
a major American invasion attempt at 
Queenston Heights, on the Niagara River. 
Much skirmishing and raiding occurred 
throughout the first part of 1813, especially 
along Lake Ontario and the Niagara frontier. 
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