Crook, George was born on September 23, 1829 in near Dayton, Ohio, United States. Son of Thomas and Elizabeth (Mathers) Crook.
Graduated from the United States Military Academy, 1852.
Commissioned Second lieutenant United States Army, 1852, First lieutenant on frontier duty in N.W., 1852-1861. Colonel 36th Ohio Infantry, 1861, in command 3d brigade Army of W. Virginia, served in battles of Lewisburg, South Mountain, Antietam, 1861. Brevetted major United States Army, 1862.
Commissioned brigadier general United States Volunteers, in command of calvalry division Army of Cumberland, 1863. Brevetted colonel, 1863, brigadier general, 1864. In command West Virginia, also in personal command one of corps in Sheridan’s Army of the Shenandoali.
Commissioned major general United States Volunteers. Commissioned major general United States Army, served in battles of Winchester, Fisher’s Hill, Cedar Creek, 1864, battles of Dinwiddie Court House, Sailor’s Creek, Farmville, 1865. Commissioned lieutenant colonel 23d Infantry, United States Army, 1865, commanded Boise (Idaho) district, 1865.
Commissioned brigadier general 1873. Commanded Department of Platte, 1875, 86-88. Participated in Great Sioux War, 1876.
Fought against Apache Indians, 1882-1886. Major general in command of Division of Missouri, 1888.