Lt. Gen. Ulysses S. Grant began a siege of the city of Petersburg, Virginia, after initial assaults on the Confederate lines, June 15–18, 1864, failed to break through. While Union cavalry conducted the Wilson-Kautz Raid (June 22 – July 1) in an attempt to cut the railroad lines leading into Petersburg, Grant and his generals planned a renewed assault on the Petersburg fortifications, an attack scheduled for July 30 that would become known as the Battle of the Crater. Hoping to increase the chances for success at Petersburg, Grant planned a movement against Richmond that Gen. Robert E. Lee would likely counter with troops taken out of the Petersburg line.