Major John T. Chunn was a Commandant at Fort Harrison.
There was no trouble with hostile Indians during the time of Major Chunn's command of the Fort. But in 1816 there was a scare. Reports came to the Fort of depredations by the Indians in Michigan and Northern Indiana, and the Fort was thronged with refugees. An autograph letter from Major Chunn to Mr. Gilbert, dated September 8, 1816, indicated possible danger, but no attack was made. During the succeeding years, 1817 and 1818, 1819 and 1820, even after the Fort had been abandoned by the garrison, there were these scares about the Indians. [Source]
A private under Major Chunn's command was Willis Copelan. A page from Mr. Copelan's pension application file detailing his injury incurred with a keel boat on the Mississippi River bank:
"While he was actually in the service aforesaid [a private in Brevt. Maj. John T. Chunn's company of the 3rd Regiment]...on the 15th of June being engaged in condeling a keel boat on the bank of the Mississippi near a place called St. Genevieve in the Territory of Missouri he received a fracture in his right thigh bone by falling from the top to the bottom of the Mississippi bank on a log.... ". 1 August 1817