On May 25, light skirmishing occurred between the lines and Union soldiers occupied themselves by tearing up 5 miles of the Virginia Central Railroad, a key supply line from the Shenandoah Valley to Richmond. Grant's options were limited. The slaughter at Spotsylvania Court House ruled out the option of frontal attacks against the Confederate line and getting around either Confederate flank was infeasible. However, the Union general remained optimistic. He was convinced that Lee had demonstrated the weakness of his army by not attacking when he had the upper hand. He wrote to the Army's chief of staff, Maj. Gen. Henry W. Halleck: "Lee's army is really whipped. ... I may be mistaken but I feel that our success over Lee's army is already assured."