On the afternoon of the 19th Ewell gained the rear of Grant's right flank, came suddenly upon Tyler's division of heavy artillery, armed as infantry, just arrived upon the field. Though surprised, they held the enemy in check, forced him back, and with aid from the Second Corps compelled him to retreat with great loss. This attack was made to cover Lee's withdrawal to the North Anna. His troops were already on the march. Grant was swift to follow. THE NORTH ANNA. It is a two days' march from Spottsylvania to the North Anna. The crossings of the Mattapony were held by Rebel cavalry, which were quickly driven. For want of space I am forced to pass over the operations on that natural line of defence,--the gallant crossing of the Fifth Corps at Jericho Ford, the irresistible charge of Birney and Barlow at Taylor's Bridge, the sweeping-in of five hundred prisoners, the severe engagements lasting three days,--all memorable events, worthy of prominence in the full history of the campaign. Instead of walking over the obstacle, Grant decided to go round it. Stealing a march upon Lee, he moved suddenly southeast, and crossed the Pamunky at Hanover Town, opened a new base of supplies at White House, forcing Lee to fall back on the Chickahominy. [ILLUSTRATION: 2, 5, 6, 9, 18. Corps. B. Bethesda Church. C. H. Coal Harbor. G. Gaines's Mill. R. Richmond.] ON THE CHICKAHOMINY. On Sunday, the 29th, there was one of the severest cavalry-engagements of the war, at Hawes's shop, west of Hanover Town, where Sheridan drove the Rebels back upon Bethesda Church. The array came into position on the 30th, its right towards Hanover Court-House. Lee was already in position, and during the day there was firing all along the line. Each corps was engaged. The Second Corps by the Shelton House with a bayonet-charge pushed the enemy from the outer line of works which he had thrown up, while the Fifth Corps rolled back, with terrible slaughter, the mass of men which came upon its flank and front at Bethesda Church. At Coal Harbor, the Sixth, joined by the Eighteenth Army Corps, under Major-General W. F. Smith, from Bermuda Hundred, met Longstreet and Breckenridge and troops from Beauregard. Sheridan had seized this important point,--important because of the junction of roads,--and held it against cavalry and infantry till the arrival of the Fifth and Eighteenth. The point secured, a new line of battle was formed on the 1st of June. The Ninth held the right at Bethesda Church; the Fifth was south of the church, joining the Eighteenth; the Sixth held the road from Coal Harbor to Gaines's Mill; while the Second was thrown out on the left, on the road leading to Despatch Station and the Chickahominy, as indicated by the diagram (p. 131). Such was the position of the army within ten miles of Richmond,--the line of battle crossing the ground occupied by Stonewall Jackson at the Battle of Gaines's Mill.