The Battle of Yorktown or Siege of Yorktown was fought from April 5 to May 4, 1862, as part of the Peninsula Campaign of the American Civil War. Marching from Fort Monroe, Union Maj. Gen. George B. McClellan's Army of the Potomac encountered Maj. Gen. John B. Magruder's small Confederate force at Yorktown behind the Warwick Line. McClellan suspended his march up the Peninsula toward Richmond and settled in for siege operations.
On April 5, the IV Corps of Brig. Gen. Erasmus D. Keyes made initial contact with Confederate defensive works at Lee's Mill, an area McClellan expected to move through without resistance. Magruder's ostentatious movement of troops back and forth convinced the Union that his works were strongly held. As the two armies fought an artillery duel, reconnaissance indicated to Keyes the strength and breadth of the Confederate fortifications, and he advised McClellan against assaulting them. McClellan ordered the construction of siege fortifications and brought his heavy siege guns to the front. In the meantime, Gen. Joseph E. Johnston brought reinforcements for Magruder.
On April 16, Union forces probed a point in the Confederate line at Dam No. 1. The Union failed to exploit the initial success of this attack, however. This lost opportunity held up McClellan for two additional weeks while he tried to convince the U.S. Navy to bypass the Confederates' big guns at Yorktown and Gloucester Point, ascend the York River to West Point and outflank the Warwick Line. McClellan planned a massive bombardment for dawn on May 5, but the Confederate army slipped away during the night of May 3 toward Williamsburg.
The battle took place near the site of the 1781 siege of Yorktown.
McClellan had chosen to approach the Confederate capital of Richmond, Virginia, with an amphibious operation that landed troops on the tip of the Virginia Peninsula at Fort Monroe. His Army of the Potomac numbered 121,500 men, transported starting on March 17 by 389 vessels. McClellan planned to use U.S. Navy forces to envelop Yorktown, but the emergence of the Confederate ironclad CSS Virginia and the Battle of Hampton Roads (March 8–9, 1862) disrupted this plan. The threat of the Virginia on the James River and the heavy Confederate batteries at the mouth of the York River prevented the Navy from assuring McClellan that they could control either the York or the James, so he settled on a purely land approach toward Yorktown.
The Confederate defenders of Yorktown, led by Maj. Gen. John B. Magruder, initially numbered only 11,000–13,000 men; the rest of the Confederate forces, under the overall command of General Joseph E. Johnston, remained spread out across eastern Virginia at Culpeper, Fredericksburg, and Norfolk. Magruder constructed a defensive line from Yorktown on the York River, behind the Warwick River, to Mulberry Point on the James River (even taking advantage of some trenches originally dug by Cornwallis in 1781) to effectively block the full width of the Peninsula, although he could adequately man none of the defensive works at that time. This became known as the Warwick Line.
The American Civil War (1861–1865) was the deadliest conflict in American history, killing an estimated 620,000 to 750,000 soldiers and an unknown number of civilians. The Confederate States of America, formed by eleven seceding Southern states, faced the Union in four years of warfare across 23 states and territories. Major engagements included First and Second Bull Run, Antietam (the bloodiest single day in American history, September 17, 1862), Chancellorsville, Gettysburg (July 1–3, 1863), Vicksburg (surrendered July 4, 1863), and Sherman's March through Georgia and the Carolinas (1864–1865). President Lincoln issued the Emancipation Proclamation on January 1, 1863, transforming the war's stated purpose to include the abolition of slavery and enabling the enlistment of approximately 180,000 Black men in the United States Colored Troops. Confederate General Robert E. Lee surrendered to Ulysses S. Grant at Appomattox Court House on April 9, 1865. The war resolved the question of secession and ended American slavery, though Reconstruction would face sustained resistance in its attempt to secure civil rights for formerly enslaved people.
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