In the spring of 1870 the 14th Infantry was transferred to the
Department of Dakota, with Private Gentles's company assigned to
Fort Randall. Two weeks later, the company was sent up the Missouri to Fort Thompson near the Crow Creek Agency. On June 10, 1870, while camped near the agency, Private Gentles re-enlisted for his third enlistment. In August 1870, the regiment was transferred to the
Department of the Platte. Traveling on the steamboat
The Far West, famous six years later for evacuating the wounded from the
Battle of the Little Big Horn, Company F arrived at Omaha Barracks, Nebraska, where they were stationed for the winter. Gentles and Company F transferred to Fort Fetterman, Wyoming, where they served from March 1871 to September 1873 and then to Fort Sanders, Wyoming, until February 1874. In early 1874, with trouble brewing with the
Oglala Lakotas at the
Red Cloud Agency in northwestern Nebraska after the killing of an agency clerk, the army dispatched a large contingent of troops to establish military posts near Red Cloud and nearby
Spotted Tail Agencies. On February 15, 1874, Private Gentles and Company F entrained to Cheyenne and marched north to
Fort Laramie. There they were met by other companies that then marched to Red Cloud Agency, where they encamped for the next four months. Shortly after returning to Fort Sanders, Private Gentles and Company F were transferred to
Camp Douglas, Utah Territory, arriving on September 5, 1874. Camp Douglas was named regimental headquarters for the 14th Infantry, under the command of Colonel John E. Smith. Most of the original log and adobe buildings at the post were in the process of being torn down and replaced by new red sandstone structures, and for the next two years soldiers at the camp, including Private Gentles, were engaged in quarrying and hauling stone as well as other garrison duties. Gentles re-enlisted for his fourth enlistment on June 10, 1875, while at Camp Douglas. ==The Great Sioux War of 1876-77==