During World War I, Hines experienced a meteoric rise in rank as he was promoted from major to lieutenant colonel in May 1917, then to colonel, brigadier general, and, in August 1918, to temporary major general—four grades in 16 months. He assumed successively larger commands—from regiment to brigade, division, and finally, corps. Hines commanded the 1st Brigade, 1st Division, from May to August 1918, during which time he received the Distinguished Service Cross, the second-highest decoration for valor in the United States Army, for "extraordinary heroism in action near Berzy-le-Sec, France, July 21, 1918." On August 16, 1918, Hines assumed command of the 4th Division. He commanded the division during the American operations at St. Mihiel and in the Meuse-Argonne until October 11, 1918. Hines then took command of III Corps, leading it during the final engagements of the war and the occupation of Germany.
Post war
Hines was promoted to permanent major general in March 1921. His post-war commands included the 5th Division, the 2nd Division and the VIII Corps Area. In December 1922, Hines was assigned as Deputy Chief of Staff of the Army, and became Chief of Staff of the United States Army on September 14, 1924. His army biography states that as Chief of Staff, he "stressed the need for balance in funding and personnel for all parts of the permanent establishment, pointed up the effects of strength deficiencies upon Army capability to meet the provisions of the National Defense Act of 1920, and urged action on housing and promotions to promote personnel retention." On May 7, 1925 Hines dedicated the landing field at the Vancouver Barracks in Vancouver, Washington, to the memory of Lieutenant Alexander Pearson, Jr., who was killed on September 2, 1924 in Fairfield, Ohio while flying the Curtiss R-8 in preparation for the upcoming Pulitzer Trophy Race. In 1926, after completing his tour as Army Chief of Staff, Hines took command of the IX Corps Area in California, which he led until 1930. In 1930, Hines became commanding general of the Philippine Department.
On May 5, 2000, the United States Postal Service issued the Distinguished Soldiers stamps in which Hines was honored. Hines' son, Colonel John L. Hines, Jr., served in World War II with the 6th Armored Division, commanding the division's Combat Command A from November 1944 to March 1945. He was twice decorated with the Distinguished Service Cross and was severely wounded outside Frankfurt, Germany when an 88 mm antitank shell grazed his face.
Dates of rank
Note that the date indicated is the date of rank. In some cases, the promotion was accepted at a later date.