Groesbeck, Stephen Walley was born on November 26, 1840 in Albany, New York, United States. Son of Garrett E. and Elsie (Walley) Groesbeck.
Educated commercial School, Albany, New York, and Military School, Philadelphia.
Enlisted 4th Iowa cavalry vols., October 28, 1861. Mustered in as quartermaster sergeant, January 1, 1862. Appointed Second lieutenant, October 5, 1862.
Totally disabled by lodging of rifle ball in left foot, in battle November 8, 1862. Resigned April 4, 1863. Upon recovery accepted appointment as Second lieutenant, Veterinary reserve corps, September 16, 1864.
Served as such in South during reconstruction period. Read law and later was admitted to bar. Appointed Second lieutenant 42d Infantry, January 15, 1867.
Transferred to 6th Infantry, April 22, 1869. Adjunct 6th Infantry, 1875-1880. Acting judge advocate, Department of Missouri, 1881-1882.
Again adjunct 6th Infantry, 1883-1886. Acting judge advocate, Department Dakota, 1886-1891. Appointed major judge advocate, March 23, 1892.
Lieutenant colonel, February 2, 1901. Colonel, May 24, 1901. Judge advocate 5th Army Corps during campaign against Santiago de Cuba, 1898, and of Division of the Philippines, 1900-1902.
Appointed brigadier general, United States of America, April 16, 1903. Retired from active service, April 17, 1903.