Battle of Saint-Eustache
1837 CE.
Shown on the map at 45.557°, -73.890°.
The Battle of Saint-Eustache was a decisive battle in the Lower Canada Rebellion in which government forces defeated the principal remaining Patriotes camp at Saint-Eustache on December 14, 1837.
Text from the Wikipedia article Battle of Saint-Eustache, licensed CC BY-SA 4.0.