In August 1864, Gen. Barnard was replaced in his capacity as chief engineer of the defenses of Washington by Lt. Col. Barton S. Alexander. With the war winding down, Alexander's duties consisted primarily of maintaining and expanding the already-existing defenses, rather than building new forts as Barnard had done. An October 1864 report from Col. Alexander to Brig. Gen. Richard Delafield, head of the U.S. Army Corps of Engineers, lists a series of improvements to Fort Stanton's already-impressive defenses. "Constructing three bastions, two new magazines, bomb-proofs, traverses, platforms, embrasures, grading glacis, and renewing abatis," the report reads.