Battle of Five Forks
On July 12, 1865, Griffin was appointed major general of volunteers to rank from April 2, 1865. On July 17, 1866, President Andrew Johnson nominated Griffin for appointment as a brevet major general in the regular army, to rank from March 13, 1865, for his service at the Battle of Five Forks and the United States Senate confirmed the appointment on July 23, 1866.