In September 1778, Lt. Helmer and eight scouts under his command were sent to the Unadilla River Valley to spy on Joseph Brant's company of Indians and Tories who were encamped at Unadilla near the confluence of the Unadilla and Susquehanna Rivers. It was feared that Brant would send a raiding party north to the Mohawk Valley during the harvest season to forcefully obtain stores for the winter ahead. When Helmer's scouts reached Edmeston Manor, the farm of Percifer Carr, just north of what is now South Edmeston, they were attacked by a large group of Brant's men, apparently part of the feared raiding party on its way north. Several of the scouts were killed, but Helmer managed to escape.