Lee's lines were extended north and east of Richmond and Petersburg for approximately ten miles, but there were several points where there were no fortifications built yet, and Cold Harbor was one of them. On June 1 and 2 both Grant and Lee were still waiting for reinforcements to arrive. Hancock's men had marched all night and arrived too exhausted for an immediate attack that morning. Grant agreed to let the men rest and postponed the attack until 5 p.m., and then again until 4:30 a.m. on June 3. However, Grant and Meade did not give specific orders for the attack, leaving it up to the corps commanders to decide where they would coordinate and attack the Confederate lines, as no senior commander had yet reconnoitered the latest Confederate developments. Grant had not yet learned that overnight Lee had hastily constructed entrenchments to thwart any breach attempt at Cold Harbor. Grant had put off making an attack twice and was anxious to make his move before the rest of Lee's army arrived. On the morning of June 3rd, the third day of the thirteen-day battle, with a force of more than 100,000 men, against Lee's 59,000, Grant attacked not realizing that Lee's army was now well entrenched, much of it obscured by trees and bushes. Grant's army suffered 12,000–14,000 casualties, while Lee's army suffered 3,000–5,000 casualties, but Lee was less able to replace them.