The Battle of Klock's Field was an engagement during the American Revolutionary War in the Mohawk Valley region of New York between British and Loyalist forces led by Lieutenant Colonel Sir John Johnson, and New York militia and levies led by Brigadier General Robert Van Rensselaer. The battle occurred on the north side of the Mohawk River in what is now St. Johnsville in Montgomery County. After defeating Colonel John Brown at Stone Arabia, Johnson dispersed his forces in small bands to a distance of five or six miles in every direction to pillage the country. He desolated Stone Arabia, and, proceeding to Klock's Field near the present village of St. Johnsville, halted to rest. General Van Rensselaer was now in close pursuit of Johnson with a strong force, having marched rapidly up the south side of the river, and was joined by Captain McKean with some 80 volunteers, together with a strong body of Oneida warriors, led by Chief Louis Atayataronghta, who had been commissioned a lieutenant-colonel by Congress. With these additions, the command of Van Rensselaer numbered about 1,500 men. Arriving at Keder's ford, Van Rensselaer found that Johnson had stationed a guard of 40 men to dispute his passage.

At about 11:00 A.M., and the Americans came to a halt, about 3 miles below Garoga Creek, still on the south side. While there, some of the fugitives from Colonel John Brown's regiment came running down, and jumping into the river, forded it without difficulty. McKean and Louis, the Oneida chief, led their respective commands through the river to the north side, expecting the main army immediately to follow. At this moment Dubois, of the State levies, rode up to Van Rensselaer, who immediately mounted his horse, and, instead of crossing the river, accompanied the Colonel to Fort Plain, some distance above, to dinner as it was understood. It was near the close of the day when Van Rensselaer arrived, and the battle was immediately begun in the open field. The enemy' s regular troops and rangers, however, fought with spirit, although Johnson himself was reported by some to have fled with the Indians. The disappointment was great, when, instead of allowing a pursuit of the Indians, or charging upon the feeble breastworks on the flats, and thus finishing the battle, Van Rensselaer ordered his forces to retire for the night. The bitter feeling among the troops and inhabitants of the valley against Van Rensselaer was intense, and charges of incompetency and even Toryism were freely made.