Authorship attributed to Captain Andrew Engle who served in 12th Pennsylvania Regiment during the revolutionary war. This ink, pencil & watercolor map depicts the topography and fortifications at West Point at the time of the revolutionary war; Fort Arnold (later named Fort Clinton) and its outlying redoubts overlooking the turn in the Hudson River, Fort Webb and Fort Putnam downriver, and the fortifications on Constitution Island across the Hudson; the famous chain that stretched across the river the control traffic is also shown. This ms. map descended in the family of Captain Andrew Engle.