The French monarch having acknowledged the independence of the revolted British provinces, and concluded a treaty with them, the nature of the war became so far changed that the evacuation of Philadelphia took place, and the army proceeded to New York. In the march from Philadelphia, through the Jerseys, the SEVENTEENTH were actively employed, and performed much severe and harassing duty; the route lying through woods, over rivers, and along difficult roads, with the enemy hovering on the flanks and rear, occasioned the services of the light cavalry to be much required. On the 28th of June, as the last brigade descended from the heights of _Freehold_, in New Jersey, the enemy appeared in the rear and on both flanks, and some sharp fighting took place; when the SEVENTEENTH, being with the advance guard, were ordered from the front to take part in the engagement. The enemy was repulsed; the army resumed its march, and one troop of the regiment, being in advance, took part in putting to flight a body of Americans. Having crossed the channel to Sandy Hook, the army embarked from thence for New York. Soon after their return from Philadelphia the strength of the SEVENTEENTH was increased by the receipt of many effective men and all the serviceable horses from the Sixteenth Light Dragoons, which corps was ordered to return to Great Britain; the horses were many of them American, as the Sixteenth had only eighty English horses left. [Sidenote: 1779] From New York the regiment was sent to the east end of Long Island, where it remained during the winter; and in the spring of 1779 it was ordered to take up a position in advance of the lines in front of New York. [Illustration: 17th Lancers, 1810. Review Order. [To face page 24. ] The SEVENTEENTH was the only British cavalry regiment in America, and no other corps was sent out; there were, however, several independent troops of provincial cavalry in the British service, also a corps, partly cavalry and partly infantry, commanded by Captain Lord Cathcart of the SEVENTEENTH Light Dragoons, who held the rank of Colonel in the provincials, and also another corps, or "legion," as it was more frequently called, under Colonel Banastre Tarleton. This legion had usually a select party of the SEVENTEENTH attached to it, who wore their own uniform, and became celebrated for their excellent conduct on the out-post duty, also for their daring spirit of enterprise when employed on detached services. While serving remotely from the head-quarters, their own uniform became worn out, and they were offered the dress of the legion; but they were proud of their regiment, and they preferred patching up their old clothing to preserve the distinction[2]. The post occupied by the regiment in front of New York was held for the purpose of clearing the country of the hostile parties, and keeping the roads clear to enable the supplies of the army to be brought in, and skirmishes occurred almost daily.