The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 7: Prisons and Hospitals.
Francis Trevelyan Miller, Ed.

Surgeons.

During the war forty surgeons were killed and seventy-three wounded while attending to their duties on the battlefield. Without the excitement of actually taking part in the fight, with no hope of high promotion, seeking no approval but that of their own consciences, these men performed their task actuated and sustained by no other impulse than the sense of duty. William James Hamilton White, of the District of Columbia, became assistant-surgeon in the regular Army March 12, 1850. He was appointed major-surgeon April 16, 1862, and met his fate five months later on the battlefield of Antietam. On this same day E. H. R. Revere, assistant-surgeon of the Twentieth Massachusetts Infantry, was killed on the battlefield. Other surgeons became ill from the excessive labor which they conscientiously and skilfully performed. Surgeon-General Hammond, accompanied by Brigadier-General Muir, deputy medicalinspector-general of the British army, visited the field, inspected the hospitals, and gave the sufferers the benefit of their professional skill soon after the close of the long and terrific battle.

William James Hamilton white Federal major-surgeon killed at the battle of Antietam

Surgeons and hospital stewards in Washington the Mercurian double-snake on the sleeve identifies the latter