The Siege of Petersburg was a significant military campaign during the American Civil War, lasting from June 1864 to March 1865. It involved the forces of the Union, led by General Ulysses S. Grant, besieging the Confederate city of Petersburg, Virginia. The siege aimed to cut off supply lines and weaken the Confederate Army, commanded by General Robert E. Lee. Throughout the siege, both sides engaged in trench warfare, resulting in a prolonged stalemate. The Union's eventual breakthrough in April 1865 led to the fall of Petersburg and subsequently the Confederate capital of Richmond, marking a turning point in the war.