The ground which Knowlton reconnoitred and which became the scene of the action remains to-day unchanged in its principal features. What was then known as Harlem Heights is that section of the island which rises prominently from the plain west of Eighth Avenue and north of One Hundred and Twenty-fifth Street. Its southern face extended from an abrupt point, called "Point of Rocks," at One Hundred and Twenty-sixth Street, east of Ninth Avenue, northwesterly to the Hudson, a distance of three quarters of a mile. At the foot of these heights lay a vale or "hollow way," through the centre of which now runs Manhattan Street, and opposite, at distances varying from a quarter to a third of a mile, rose another line of bluffs and slopes parallel to Harlem Heights. This lower elevation stood mainly in the Bloomingdale division of the city's out-ward, and is generally known to-day as Bloomingdale Heights. In 1776 there were two farms on these heights, owned and occupied by Adrian Hogeland and Benjamin Vandewater, which were partly cultivated, but mainly covered with woods. The Bloomingdale Road, as stated in a previous chapter, terminated at Hogeland's lands about One Hundred and Eighth or Tenth streets, and from there a lane or road ran easterly by Vandewater's and joined the King's Bridge road near One Hundred and Twentieth Street. East of the Bloomingdale and south of Harlem Heights stretched the tract of level land called Harlem Plains.
After the retreat of the 15th, Washington's army encamped on Harlem Heights, with their pickets lining the southern slope from Point of Rocks to the Hudson. The British, as we have seen, lay at Bloomingdale and across the upper part of Central Park to Horn's Hook. An enemy, posted at the lower boundary of Harlem Plains, around McGowan's Pass, where the ground again rises at the northern end of the Park, might be easily observed from the Point of Rocks, and any advance from that quarter could be reported at once. Nothing, however, could be seen of movements made on the Bloomingdale Road or Heights, and it was in that direction that the "Rangers" now proceeded to reconnoitre at dawn on the 16th.
Knowlton, marching under cover of the woods, soon came upon the enemy's pickets, somewhere, it would appear, between Hogeland's and Apthorpe's houses on the Bloomingdale Road, more than a mile below the American lines. This was the encampment of the Light Infantry, and their Second and Third Battalions, supported by the Forty-second Highlanders, were immediately pushed forward to drive back this party of rebels who had dared to attack them on their own ground. Anticipating some such move, Knowlton had already posted his men behind a stone wall, and when the British advanced he met them with a vigorous fire. His men fired eight or nine rounds a piece with good effect, when the enemy threatened to turn his flanks, and he ordered a retreat, which was well conducted. In this brief encounter the Rangers lost about ten of their number, and believed that they inflicted much more than this loss upon the Infantry.[196]