 Boyne assisted the cavalry in removing Sooners from native lands in Oklahoma and endured frostbite in the winter of 1884-1885 as a result.Boyne reenlisted into the 25th Infantry in July 1885 and was stationed in the Black Hills of the Dakota Territory.He developed a hernia in Montana in 1888 while supervising a wood-gathering detail and the Army discharged him in January 1889 with a disability pension.