Chateaugay (shătˈəgē, –gāˌ) [key], river, c.50 mi (80 km) long, rising in Chateaugay Lake in the Adirondacks, NE N.Y., and flowing through Quebec to empty into the St. Lawrence 10 mi (16 km) below Montreal, opposite the mouth of the Ottawa River. In the War of 1812 the battle of Chateaugay was fought (1813) on the banks of the river in Quebec between an American invading force of 7,000 under Gen. Wade Hampton and some 750 Canadians and Native Americans. The Americans were defeated and had to abandon their plan to attack Montreal.
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