Major General John A. "Black Jack" Logan, from the Library of Congress.

Civil War Trust's biography of John Logan is here. 

Photos:
(1) Monument of Gen. John A. Logan, Chicago, Ill. (on horseback, with group of people, mostly seated on lawn, in foreground), c1900; (2) Logan, wartime portrait; (3) Washington, District of Columbia. The Grand Review of the Army. Gen. John A. Logan's 15th Army Corps passing on Pennsylvania Avenue near the Treasury, May 1865, Mathew Brady.