Dictionary of Canadian Biography Online's entry for Thomas Gummersall Anderson "Indian agent; b. at Sorel, Province of Quebec, 12 Nov. 1779, sixth son of Captain Samuel Anderson, loyalist, and Deliverance Butts; d. at Port Hope, Ont., 10 Feb. 1875."
Fort McKay, Aug. 26, 1814
To Lieut. [Duncan] Graham--
Sir--The expedition for the Rock River under your command, being now in readiness,... . On your arrival there you will assemble the Indians and explain to them that the intention of the expedition is to support them in defending their lands and women and children according to promises made to them by their father Robert Dickson and Lieut Col. McKay.... .
That they must not amuse themselves during the action in taking scalps. They must destroy the enemy as much as possible except prisoners.
Thos G Anderson, Capt Comd'g
Note: Lieutenant Graham's forces met the American forces under Zachary Taylor at Credit Island. The War of 1812 Archaeology blog described it as "The Forgotten Battle."