War of 1812
Major General Isaac Brock with 40 men of His Majesty's 41st Regiment and 260 of the York, Lincoln, Oxford and Norfolk militia, set out from Port Dover on the 8th August, 1812, to relieve the invaded western frontier. His brilliant capture of Hull's army at Detroit with a much smaller force saved this province to the Empire and made Brock "The Hero of Upper Canada."
Plaque via Alan L. Brown's site Ontario Plaques. Full page here.