From ‘New Hartford History’ by Sarah Lucia Jones, pg 406:
“The first record pointing to active service by New Hartford troops us a reference to powder taken from the town stock by Israel Loomis at the time of the expedition against the fort at Lake George, from which it is gathered that a detachment of men under Lieut. Loomis were at the attack on Ticonderoga in 1758. The town records also mention the death of Nathaniel Seymour at Crown Point, Oct. 20, 1760; there were probably others who served at the same time who lived to return.”
This was part of the campaigns of the French-Indian War. New Hartford troops were also involved in the Battle of Havana in 1762. Many, of course, were involved in the Revolutionary War, including an immediate response to the battles of Lexington and Concord.