The American position at the Heights, strong by nature, was made still more so by defensive works. Three lines of intrenchments and redoubts were thrown across the island between One Hundred and Forty-fifth and One Hundred and Sixty-second streets; batteries were built around King's Bridge, and at several points on the heights overlooking the Harlem; and on the commanding site on the line of One Hundred and Eighty-third Street, two hundred and thirty feet above the Hudson, stood the powerful fortress called Fort Washington. Describing these works more in detail, the first of the three lines, that furthest south, was the one already referred to on which troops were digging during the action of Harlem Heights. It extended along the line of One Hundred and Forty-sixth Street. The second line, which was much stronger, was laid out a short distance above at One Hundred and Fifty-third Street. There were four redoubts in the line. Less than half a mile above, between One Hundred and Sixtieth and One Hundred and Sixty-second streets, and not extending east of Tenth Avenue, or the old Post Road, was the third line. It mainly commanded the depression in the heights which is now known as Audubon Park, and included no redoubts. In addition to this triple line, there were single breastworks and batteries at various points from Point of Rocks north, along the ridge. The high and rugged bank of the Harlem overlooking the present High Bridge was known as Laurel Hill, and at the northern extremity, at One Hundred and Ninety-second Street, there was an American battery, which the British afterwards named Fort George. On the west side, at One Hundred and Ninety-sixth Street, there was a small battery which became Fort Tryon. On the further side of Spuyten Duyvil Creek stood Fort Independence, commanding King's Bridge and its approaches.[206] [Footnote 206: The position of the various works at Harlem Heights appears on Sauthier's plan which seems to have accompanied Howe's report of the capture of Fort Washington. Good copies of it may be found in Stedman's history and in the _New York Revolutionary MS._, vol. i. In 1812, when Randall surveyed the island, many of these works were still traceable. He gives parts of the second and third lines, Fort Washington and the others above, all of which agree with Sauthier's locations. Some of the works remain well preserved to-day.]