The Battle of the Crater was a battle of the American Civil War, part of the Siege of Petersburg. It took place on July 30, 1864, between the Confederate Army of Northern Virginia, commanded by General Robert E. Lee and the Union Army of the Potomac, commanded by Major General George G. Meade (under the direct supervision of the general-in-chief, Lt. Gen. Ulysses S. Grant).
The plan called for the mine to be detonated between 3:30 and 3:45am on the morning of July 30.
The explosion immediately killed 278 Confederate soldiers, and stunned Confederate troops did not direct any significant musket or artillery fire at the enemy for at least 15 minutes. However, Ledlie's untrained division was not prepared for the explosion, and reports indicate they waited ten minutes before leaving their own entrenchments.