In 1836, Minty’s father, also named Robert, is promoted to lieutenant in the 1st West India Regiment of Foot, which is a regiment of black enlisted men with white officers. The whole family leaves Ireland and travels with him through Minty’s later childhood and teenage years. They move all around the Caribbean and West Africa ultimately being sent to Sierra Leone.
Minty’s father becomes judge advocate general in Jamaica in 1846 but dies after falling victim to yellow fever in 1848. Though he is only 17 at the time, he is allowed to take over his father’s commission in the regiment. After serving five years in the regiment he resigns his commission, possibly because he nearly becomes a victim of a tropical disease himself.
Minty immigrates to Ontario, Canada, where his mother and the family had moved after his father’s death. He is hired by the Great Western Railroad Company at a time when the railroad business is exploding in both the United States and Canada. He is involved with railroads for the rest of his life, with time out for the American Civil War.
Minty is commissioned as Major of the 2nd Michigan Cavalry Regiment on October 2, 1862, but holds that duty for only a month before he is transferred to the 3nd Michigan Cavalry Regiment and promoted to Lieutenant Colonel. His time with the new regiment is again relatively brief, for in March 1862 he is given the task of recruiting another regiment that becomes the 4th Michigan Cavalry Regiment.
Promoted to Colonel and officially given command of the unit on July 21, 1862, Minty leads it as it fights in Kentucky, Tennessee, Georgia and the Carolinas, taking part in the Battle of Chickamauga and the Battle of Atlanta. He is brevetted Brigadier General, U.S. Volunteers and Major General, U.S. Volunteers on March 13, 1865 for “gallant and meritorious services during the war.”
Minty and the men under his command are noted as being the regiment that captures the fleeing President of the Confederate States of America, Jefferson Davis, at Irwinville, Georgia on May 9, 1865, as the Confederacy collapses.
Minty is honorably mustered out of the Union Army on April 15, 1865 at Nashville, Tennessee, and becomes a successful railroad executive in his post-war career. He dies at the age of 74 on August 24, 1906, in Jerome, Arizona. He is buried at Aultorest Memorial Park in Ogden, Utah.