The extreme right of the Union line, under command of General Porter, lay near Mechanicsville, on the Upper Chickahominy. It was strongly entrenched and was almost impregnable to an attack from the front. Before sunrise, June 26th, the Confederates were at the Chickahominy bridge awaiting the arrival of Jackson, but for once Jackson was behind time. The morning hours came and went. Noon came and Jackson had not arrived. About the middle of the afternoon, General A. P. Hill, growing impatient, crossed the river at Meadow bridge, and at Mechanicsville was joined by the divisions of Longstreet and D. H. Hill. Driving the Union outpost to cover, the Confederates swept across the low approach to Beaver Dam Creek through a murderous fire from the batteries on the cliff, but were finally repulsed with severe loss. Later in the afternoon relief was sent Hill, who again attempted to force the Union position at Ellerson's Mill. From across the open fields, and in full view of the defenders of the cliff, the Confederates moved down the slope in full range of the Federal batteries, but the fire was reserved by the Federals. As the approaching columns reached the stream the shells came screaming through the air from every waiting field-piece. Volley after volley of musketry was poured into the ranks of the Southerners. The hillside was soon covered by the victims of the gallant charge. As darkness hovered over them there were no signs of the cessation of the combat. It was nine o'clock when Hill finally drew back his shattered forces to await the coming of the morning. The Forty-fourth Georgia regiment suffered the loss of all of its officers, and thereby was unable to re-form its broken ranks. Both armies now prepared for another day of conflict. McClellan became convinced that Jackson was really approaching with a large force, and decided to change his base to the James River, leaving Porter with the Fifth corps on the banks of the Chickahominy, to prevent Jackson from interrupting this gigantic movement. It involved marching an army of 100,000 men, with a train of 5,000 heavily loaded wagons, and many siege-guns, together with 3,000 cattle to be driven across the marshy peninsula. On the night of the 26th, McCall's division was directed to fall back to the bridges across the Chickahominy near Gaines' Mill, and there make a stand, for the purpose of holding back the Confederates. Just before daylight the operations of moving the troops began.