Single sheet. Engraved. Scale: ca. 1:6 000 (bar). Cartographic Note: Ungraduated. Bar scale in feet. Additional Places: New York. Contents Note: Contains an inset chart: Part of Hudsons River, shewing the position of Fort Montgomery and Fort Clinton, with the Chevaux de Frieze, cables, chains, &c to obstruct the passage of his Majesty's forces up the river. By Lieut. John Knight of the Royal Navy in 1777. [ca. 1:80 000 (bar)], Shows roads, fortifications and a chain boom. Contains a lettered key. Imprint 1st Jan 1779. Hachured relief with stipple shading and trees. Printed on Bates paper. Border yellow, land brown, fortifications red and yellow. Page number '*5' on a paper rectangle pasted bottom right.