Military
From 1778 until the mid-19th century, Coteau-du-Lac was the site of a British military post that defended the passage and facilitated the transportation of supplies along the St. Lawrence. It was strategically important to the defence of Canada during the American Revolution and the War of 1812, when fortifications were added to strengthen its position. In addition to the supply depot and fort, one of the earliest locks in North America was constructed here in 1779-80 on a canal that remained in continual use until it was superseded by the Beauharnois Canal in the 1840s.
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