430. To the James, June, 1864.--Grant again withdrew his army and resumed his southward march. But when he reached Cold Harbor, Lee was again strongly fortified. Both armies were now on the ground of the Peninsular Campaign. For two weeks Grant attacked again and again. Then on June 11 he took up his march for the last time. On June 15 the Union soldiers reached the banks of the James River below the junction of the Appomattox. But, owing to some misunderstanding, Petersburg had not been seized. So Lee established himself there, and the campaign took on the form of a siege. In these campaigns from the Rapidan to the James, Grant lost in killed, wounded, and missing sixty thousand men. Lee's loss was much less--how much less is not known. [Illustration: A BOMB PROOF AT PETERSBURG AS IT APPEARS TO-DAY WITH THE TREES GROWING ON THE BREASTWORKS.] [Sidenote: Importance of Petersburg.] 431. Petersburg, June-December, 1864.--Petersburg guarded the roads leading from Richmond to the South. It was in reality a part of the defenses of Richmond. For if these roads passed out of Confederate control, the Confederate capital would have to be abandoned. It was necessary for Lee to keep Petersburg. Grant, on the other hand, wished to gain the roads south of Petersburg. He lengthened his line; but each extension was met by a similar extension of the Confederate line. This process could not go on forever. The Confederacy was getting worn out. No more men could be sent to Lee. Sooner or later his line would become so weak that Grant could break through. Then Petersburg and Richmond must be abandoned. Two years before, when Richmond was threatened by McClellan, Lee had secured the removal of the Army of the Potomac by a sudden movement toward Washington (p. 321). He now detached Jubal Early with a formidable force and sent him through the Shenandoah Valley to Washington. [Illustration: GENERAL SHERIDAN.] [Sidenote: Confederate attack on Washington, 1864.] [Sidenote: Sheridan in the Valley. _Hero Tales_, 263-290.] [Sidenote: Confederate disaster, October, 1864.] [Sidenote: Lincoln reëlected, November, 1864. _McMaster_, 425-426.]