The "Heights" were the location of a BritishArmy post during the War of 1812. Batteries (on the north and south ends), magazine, Sally port and earthworks were built to create a line of defence during 1812-1815. Troops with the 8th and 49th Regiments of Foot were stationed at the Heights after being forced to retreat from advancing American troops in May 1813.
Afterwards, the former army barracks were used as a hospital for immigrants with contagious diseases, most notably cholera. Also nearby is the 72-room Dundurn Castle.