There is a great book on the 4th Louisiana Battalion - The Fourth Louisiana Battalion in the Civil War A History and Roster - written by Terry Scriber and Theresa Arnold-Scriber. You may wish to pick up this book
Company C was formed primarily of men from Franlkin Parish, Louisiana.
There were Barfields in this unit and Co E, 8th Louisiana Regiment. The only Roberts in the 4th Was Robert Roberts, and was only a Private.
JIM T