until July 1914. He again was assigned as an instructor at the Mounted Service School at Fort Riley, Kansas, until January 1915, when he rejoined the 5th Field Artillery at Fort Sill, where he was stationed until June 1915. His next assignment was to the United States Military Academy, West Point, New York, as an instructor in the Department of Tactics, in which capacity he served until August 1917. He subsequent assignments during World War I included the command of the 332d Field Artillery at Camp Grant, Illinois, from August to December 1917; command of the 116th Field Artillery at Camp Wheeler at Macon, Georgia, from January to March 1918; duty as Assistant to the Chief of Field Artillery in Washington, D.C., from March to May 1918; command of the Field Artillery Brigade Firing Center at Fort Sill, Oklahoma, from May to October 1918; duty in the Office of the Chief of Field Artillery, Washington, D.C., in November 1918; and an assignment with the War Plans Division of the War Department General Staff, Washington, D.C., from December 1918 to October 1919. Resigning on October 28, 1919, he became president and superintendent of the Kentucky Military Institute at Lyndon, Kentucky. He was re-commissioned in the Regular Army on July 1, 1920. From December 1920 to July 1922 he was Assistant Commandant of the Field Artillery School at Fort Bragg at Fayetteville, North Carolina. The newly established school was expected to attract officers from all over the country to Camp Bragg, considered by artillerymen as the Army’s best practice range. MAJ Gruber was Camp Bragg Commander from 1 February 1921 to 15 February 1921. From August 1922 to July 1923, he was a student officer at the General Staff College at Fort Leavenworth, Kansas. Completing that course as a distinguished graduate, he was assigned to duty as an instructor at the Cavalry School at Fort Riley, Kansas, in which capacity he served until June 1926. He then was ordered to Washington, D.C., as a student officer at the Army War College. He was graduated in June 1927 and was ordered to Fort Leavenworth, Kansas, where he served for five years as instructor at the Command and General Staff School. From September 1932 to June 1935, he served in the Panama Canal Zone at Forts Davis and Clayton. Returning to the United States in the summer of 1935 he was detailed to duty