10/28/2026
🇺🇸 Freedom 250:
📅 On this day… Battle of Yorktown – General Cornwallis Surrender – Oct. 28, 1781
At the Siege of Yorktown (September–October 1781), Continental Army Chief Engineer Brigadier General Louis Lebègue Duportail, working alongside allied French engineers, directed classic Vauban siege craft—digging parallels, constructing breaching batteries, and clearing obstacle networks—to systematically trap and force the surrender of British forces under General Charles Cornwallis. Yorktown stands as the Revolutionary War’s premier demonstration of combined-arms engineering and technical precision in the U.S. Army Corps of Engineers.
The Siege of Yorktown was the climactic engagement of the Revolutionary War, leading directly to the Treaty of Paris and the international recognition of American independence.
Yorktown was fundamentally an engineer-led operation. The systematic construction of parallel trenches, siege redoubts, and artillery batteries neutralized British defenses without requiring a frontal assault.
Newly-formed companies of Sappers and Miners proved critical during the night assault on October 14. Sapper units equipped with axes and fascines cleared heavy obstacles and felled timber at Redoubts No. 9 and No. 10, allowing infantry forces under Lt. Col. Alexander Hamilton to take the positions in minutes.
The Sappers and Miners who breached Yorktown’s abatis established the heritage of modern Army combat engineers (mobility, counter-mobility, and survivability).
