Fort Wellington
Constructed in 1812 and 1813 under direction of Lieutenant Colonels Thomas Pearson and George R.J. Macdonell, as the main post for the defence of the communication between Kingston and Montreal, and named Fort Wellington, in honour of the victory gained at Salamanca, 22nd July, 1812. Here Lieutenant Colonel G.R.J. Macdonell assembled the force that took Ogdensburg, 22nd February, 1813. Here also Lieutenant Colonel Plomer Young assembled the troops engaged in repelling the invasion at the Windmill, 11th-13th November, 1838.
Plaque via Alan L. Brown's site Ontario Plaques. Full page here.