Daniel McCook (1798–1863), Major, killed in action at the Battle of Buffington Island during Morgan's Raid Dr. Latimer A. McCook (1820–1869), Major, 31st Illinois Infantry, wounded at Vicksburg and again during Sherman's March to the Sea; died of complications from his wounds and exposure following the war
George Wythe McCook (1821–1877), Lt. Colonel, 2nd Ohio Infantry; Colonel, 157th Ohio Infantry; Ohio Attorney General and candidate for Governor of Ohio Robert Latimer McCook (1827–1862), Brigadier General, killed by one of John Hunt Morgan's cavalrymen near Salem, Alabama, as he laid in an ambulance after a previous injury.
Alexander McDowell McCook (1831–1903), Major General; commanded XX Corps
Daniel McCook, Jr. (1834–1864), Brigadier General, killed in action at Kennesaw Mountain
Edwin Stanton McCook (1837–1873), Brevet Major General and Governor of the Dakota Territory, assassinated in office
Charles Morris McCook, (1843–1861), Private, 2nd Ohio Infantry, killed in action at the First Battle of Bull Run; died in his father's arms. He had declined an offer of a Lieutenant's commission in the regular army and is buried in Spring Grove Cemetery, Cincinnati, Ohio.
John James McCook (lawyer) (1845–1911), Colonel, prominent postbellum New York attorney and railroad executive (Another son, J. James McCook (1823–1842), had died near Rio de Janeiro, Brazil, while serving in the United States Navy)
"Tribe of John"
Dr. John James McCook (1806–1865), volunteer surgeon during the Civil War Edward Moody McCook (1833–1909), Major General and Governor of the Colorado Territory
Anson George McCook (b. 1835–1917), Brevet Brigadier General and postbellum politician
Roderick McCook (1839–1886), Commander, first Naval officer to capture a Confederate regiment
Henry Christopher McCook (1837–1911), Lieutenant, Presbyterian Chaplain; tended to the wounded and often joined in the fighting