After weeks of preparation, on July 30 the Federals exploded a mine in Burnside's IX Corps sector beneath Pegram's Salient, blowing a gap in the Confederate defenses of Petersburg.
From this propitious beginning, everything deteriorated rapidly for the Union attackers. Unit after unit charged into and around the crater, where soldiers milled in confusion.
The Confederates quickly recovered and launched several counterattacks led by Major General William Mahone. The break was sealed off, and the Federals were repulsed with severe casualties.
Ferrarro's division of black soldiers was badly mauled. This may have been Grant's best chance to end the Siege of Petersburg. Instead, the soldiers settled in for another eight months of trench warfare.
Major General Ambrose E. Burnside was relieved of command for his role in the debacle.
Result(s): Confederate victory
Campaign: Richmond Petersburg Campaign (June 1864-March 1865) next battle in campaign previous battle in campaign
Date(s): July 30, 1864
Principal Commanders: Major General Ambrose E. Burnside [US]; General Robert E. Lee [CS]
Forces Engaged: IX Corps [US]; elements of the Army of Northern Virginia [CS]
Estimated Casualties: 5,300 total