devin was mustered out of the volunteer service on january 15, 1866. on january 13, 1866, president andrew johnson nominated devin for appointment to the brevet grade of major general of volunteers, to rank from march 13, 1865, and the u.s. senate confirmed the appointment on march 12, 1866. president johnson also appointed devin brevet colonel in the regular army for fisher's hill, to rank from march 2, 1867. on march 26, 1867, president johnson nominated devin for appointment to the brevet grade of brigadier general in the regular army for sayler's creek, to rank from march 2, 1867, and the u.s. senate confirmed the appointment on april 5, 1867.