MAJOR-GENERAL W. T. SHERMAN.

THE CHANGE OF BASE.

The weary hours of the sultry night following the battle of Gaines’ Mill were heavy laden to the soldiers of the army of the Potomac.—While the rear guard was taking positions to beat back the advance of the foe on the next day, the main body of the army continued a retreat which every man felt to be ignominious; and rolled backward, like a mighty stream turned from its source, toward the James river.

On the evening of June 27th General McClellan assembled his corps commanders at his headquarters, and informed them of the proposed change in his base of operations, his reasons, his choice of route and method of execution.

General Keyes was directed to move his corps across White Oak swamp, and to seize strong positions on the opposite side, in order to cover the passage of the troops and trains—a movement which he executed the following morning.

General McClellan spent the day at Savage’s Station, directing the withdrawal of the trains and supplies of the army. Orders were given to load the wagons with all the ammunition, provisions, and necessary baggage of officers and men that could be placed on them, and to destroy all property which could not be transported with the army.

A proper number of surgeons and attendants, with a bountiful supply of rations and medical stores were left with the sick and wounded who could not be removed.

A herd of beef cattle numbering twenty-five hundred head was transferred in safety to the James river, by the Chief Commissary, Colonel Clark.

The enemy opened on General Smiths’ division from Garnett’s Hill, from the valley above, and from Gaines’ Hill on the opposite side of the Chickahominy, while General Franklin was in the act of withdrawing his command from Golding’s farm. A short time after, a Georgia regiment made an attempt to carry the works about to be vacated, but were instantly repulsed by the Twenty-third New Jersey and Forty-ninth Pennsylvania Volunteers, on picket duty, aided by a section of Mott’s battery.