He was nominated for promotion to general officer, but the territory required his judicial expertise more than his military ability and he resigned his commission June 4, 1864. Subsequently, President Abraham Lincoln nominated Caldwell to both the United States District Court for the Eastern and Western Districts of Arkansas on May 2, 1864, both seats having been previously vacated by Daniel Ringo. He was confirmed by the United States Senate on May 28, and received commission on June 20.
Caldwell
Daniel Ringo