Do you show any of these names in your database?
Andrew H. Hazlett H. Brownell (Philo H maybe)
Peter Wilson Charles Vimpeny
Joel Spence Shropshire Daniel C. Vail
George Loucks Perry J. Cook
William Nance William Townsend
They were all 14th Iowa Infantry Company G captured at Pleasant Hill. I believe Nance, Vail, Townsend and Brownell died as POWs, the rest were exchanged.
Also do you know if the Camp Ford museum/vistors center has a library/archives for research?