He was promoted lieutenant on 28 October 1902, and captain on 28 July 1909 (by which time he was serving with the 35th Sikhs). In the First World War he served as a GSO2 (staff officer) on the Imperial General Staff, reaching the rank of Brevet Lieutenant-Colonel and being mentioned in despatches twice. In 1915 he married Gwendolyn Marjorie Georges; they had a son, Captain John Ralph Carré Carter, and a daughter, Joan M. Carter.
He was advanced to lieutenant on October 28, 1902, and captain on July 28, 1909 (by which time he was serving with the 35th Sikhs). In World War I, he served as a GSO2 (staff officer) in the Imperial General Staff, reaching the rank of Brevet Lieutenant-Colonel and being mentioned in dispatches twice. In 1915, he married Gwendolyn Marjorie Georges; they had a son, Captain John Ralph Carré Carter, and a daughter, Joan M. Carter.