An original of this popular image was just shown on PBS' Antiques Roadshow. A direct descendant of Andrew Chandler shared it, and the appraiser told him it was worth $30,000 - $40,000. The man appearing on the show said that the Black Confederate & slave, Silas Chandler, fought with his master and used a gold piece to bribe Union doctors in order to keep them from amputating his master's leg. According to this gentleman, Silas received a Confederate pension. The families of both men have reconnected and are now friends.
Andrew & Silas Chandler