The Battle of the Windmill
After the 1837 Rebellions many rebels fled to the United States where a few joined American sympathizers in a new attempt to overthrow British rule in Canada. On 12 November 1838 they landed 190 men here and seized this windmill and nearby buildings. The local people remained loyal, reporting to their militia units; in a few days 2,000 militia and regulars, supported by naval vessels, besieged the mill. Although British guns did little damage to the mill, the insurgents, seeing no escape, surrendered on the 16th. Eleven were later executed and 60 exiled to Australia.
Plaque via Alan L. Brown's site Ontario Plaques. Full page here.