But the advance of General Jackson by Coal Harbor made it necessary to withdraw the troops from this strong position and concentrate the entire force on the north bank, to cover the bridges which had been constructed between the two wings of the army. During the night General McCall's division was withdrawn, contrary to the remonstrances of the brave men who had held the ground against five times their force; but they did not know that Jackson was on their rear with 40,000 men.

General McClellan ordered the heavy guns and all the baggage to be sent across the Chickahominy. He had already meditated a retreat to the James River.

"Run the cars to the last moment, and load them with provisions and ammunition. Load every wagon you have with subsistence, and send them to Savage Station," was the order sent to Colonel Ingalls, the Chief Quarter-Master at White-House.

THE BATTLE OF GAINES'S MILLS.

The battle which was fought on the 27th of June is known in the South as the battle of Coal Harbor; in the North, as the battle of Gaines's Mills. General Fitz-John Porter commanded the Union troops, and General Lee the Rebel army.

Starting from the Chickahominy and traveling up the little creek which supplies Dr. Gaines's Mill with water, we come to the battle-field, which lies on our right hand, east of the creek. The ravine is narrow and the banks on both sides are steep. General Porter has cut down the trees which stood on the hillside, and has thrown up rifle-pits and intrenchments. He is to hold the enemy in check, while General McClellan makes preparations for a retreat to James River. He has thirty thousand men against seventy thousand. Commencing on the creek near the Chickahominy, we see on our right hand General Morrell's division, with Butterfield's, Martindale's, and Griffin's brigades. Upon the other side is Longstreet, A. P. Hill, and Whiting.

General Griffin's brigade is south of the road which comes down from Coal Harbor. Across the road is General Sykes's division of regulars, composed of Warren's, Chapman's and Buchanan's brigades, confronted by Ewell's, D. H. Hill's, and Jackson's divisions. General Porter's second line at the beginning of the battle is composed of McCall's division, stationed near the center, in rear of Griffin. He has some cavalry on the road leading to Alexander's Bridge.

Battle of Gaines's Mills.