Checked the Soldiers & Sailors System. I guessed that Bert was short for Albert. Your man could be A.W. Raines, Pvt./Corp. Co. H 2nd Miss. Inf. He is also listed as James A. Raines.

For more on the 2nd Miss. go to the Mississippi SCV
http://www.mississippiscv.org/

2nd Miss. capsule history:

http://mississippiscv.org/MS_Units/2nd_MS_Inf.htm
Company H -- Conewah Rifles (raised in Pontotoc County, Mississippi.

To be certain order his records on the message board's site.