John James McCook (lawyer)

John James McCook
John James McCook
Nickname(s)	Buck
Born	(1845-05-25)May 25, 1845 Carrollton, Ohio
Died	September 17, 1911(1911-09-17) (aged 66) Sea Bright, New Jersey
Allegiance	United States of America Union
Service/branch	Union Army
Rank	Captain Brevet Colonel
Unit	52nd Ohio Infantry 6th Ohio Cavalry
Battles/wars	American Civil War
Relations	Daniel McCook (father) John James McCook (uncle)
Other work	attorney, business director

John James McCook (May 25, 1845 – September 17, 1911) was an American corporate attorney, business director, and soldier, serving as a Union Army officer during the American Civil War. He was the youngest member of the famed "Fighting McCooks," a prominent Ohio military family which contributed fifteen members to the war effort.

John J. McCook was born in Carrollton, Ohio, to family patriarch Daniel McCook. He was named for his uncle, John James McCook. He enrolled in Kenyon College, but left school after completing his freshman year to enlist as a private in the 52nd Ohio Infantry on August 12, 1862, but was not mustered into the service, initially because of his age. He accompanied the regiment as a volunteer aide-de-camp. On September 12 of that year, he was commissioned as a first lieutenant in the 6th Ohio Cavalry and assigned to the staff of Major General Thomas L. Crittenden in what later became the XXI Corps in the Army of the Cumberland. McCook was involved in several campaigns and battles in the Western Theater, including Perryville, Stones River, the Tullahoma Campaign, Chattanooga, and Chickamauga.