Also called the "Battle of Old Men and Young Boys", it was fought on June 9, 1864 just outside Petersburg. The armies of Lee and Grant were deadlocked just outside of Richmond in their Cold Harbor defenses. Butler knew Grant would probably soon attack Petersburg since it was the key supply point for Richmond. By way of intelligence from slaves and Confederate deserters and a captured Confederate map, Butler realized Petersburg was not well defended. In Petersburg, Confederate generals Beauregard and Wise had only 2,200 militiamen guarding the city. One Petersburg citizen called them a collection of "greyhaired men, and beardless boys." Some were not even equipped with rifles. Butler saw an opportunity and sent a force of 3,400 infantrymen along with 1,300 cavalry to attack Petersburg before Grant could get there. The Union infantry attacked from the east while the cavalry attacked from the south using the Jerusalem Plank Road. The infantry attack was intended as a diversion while the cavalry entered the city from the south. But the 2,500 Confederate defenders fought off both attacks. The infantry was stopped by the Dimmock Line which had been constructed to stop any such attacks. After the attacks failed, Butler withdrew.