He stayed with General Lee throughout the war and until the day Lee died in 1870. Mack said of General Lee after his death “I was raised by one of the greatest men in the world. There was never one born of a woman greater than General Robert E. Lee, according to my judgment. All of his servants were set free ten years before the war, but all remained on the plantation until after the surrender.”

General Lee left Mack $360 in his will, which Mack used to go to school and started 14 churches. He became an ordained Missionary Baptist minister in Washington, DC