THE Army of the Potomac lay massed about the city of Frederick. Lee was rushing toward the Susquehanna. Hooker disagreed with Halleck at Washington regarding his method of attack and resigned his command, requesting instant release from further responsibility. Lincoln accepted the resignation and appointed General George G. Meade to the chief command. In the midst of this momentous campaign the great army changed leaders. This photograph was taken shortly after Meade began his operations. It shows him with his generals of the Army of the Potomac. Meade occupies the chair in the center of the picture. At this time he was about forty-eight years of age. He had graduated from West Point when nineteen years old, but resigned the following year and remained out of the army for the next six years, but returned in the period preceding the Mexican War, after which he was engaged in the survey of the northern lakes. He was one of the first to respond to the call in 1861. He took part in the early engagements of the Army of the Potomac and was in the Battle of Mechanicsville and Gaine's Mills and the Battle of Newmarket Crossroads. When Hooker was wounded at Antietam, Meade took charge of a corps and continued the brave fight during the remainder of the day. He had two horses killed under him and was slightly wounded, but did not leave the field. At Fredericksburg he led his men boldly to the Confederate works. In the Battle of Chancellorsville, Meade's corps carried the earth-works and fought fearlessly. On the twenty-eighth day of June, in 1863, Meade assumed command of the Army of the Potomac. The tide of battle seemed to turn with his appointment and his victories are almost unparalleled. [Illustration: PHOTOGRAPH TAKEN WHEN MAJOR-GENERAL GEORGE G. MEADE COMMANDED THE ARMY OF THE POTOMAC] [Illustration: PHOTOGRAPH TAKEN ON THE FIELD OF GETTYSBURG AFTER THE BATTLE IN 1863]