While at camp with the main army at White Plains the same season, the Second New York Regiment was sent to guard the frontiers in Ulster County against the depredations of the Indians under Brant, who had already destroyed several houses and murdered men, women and children. It remained in the neighborhood of Laghawack, on this duty, during the winter of 1778-79; and in the Spring while on the march to surprise Brant stationed on the Delaware with about one hundred and fifty Indians, an express from General Washington overtook the regiment with orders to proceed to Fort Penn, there to await orders from General Sullivan. It is at this point that the Journal of Lieutenant Hardenbergh, herewith published, dates. On its return from the Expedition, the regiment proceeded to Easton, Pennsylvania, and from thence to Morristown, N.J., where it was hutted for the winter. In the spring of 1780 it was sent to Fort Edward for temporary service, and in June proceeded to West Point, and in expectation of an attack from the enemy, was posted on the mountain west of Fort Putnam. This proved, however, to be a feint to cover an invasion of the Jerseys. During the treason of Arnold the regiment was at Tappan, whither Andre was taken after his capture, and where he was tried and executed. From the autumn of 1776 to the winter of 1780, Lieutenant Hardenbergh was identified with the Second New York, sharing its fortunes, and participating in the important battles in which it was engaged, when the five New York regiments were consolidated into two, in which arrangement he fell into that class of officers who were retained in service but not attached to any battalion. But in July 1782 he was made Captain of Levies under Lieut. Col. Weissenfels, in which capacity he continued for the remainder of the war.