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
2nd Miss. capsule history:
Company H -- Conewah Rifles (raised in Pontotoc County, Mississippi.
To be certain order his records on the message board's site.