What became of Confederate soldier Amy CLARKE?

I am interested in learning about the life and times of Amy and Walter CLARKE of Iuka, Tishomingo, Mississippi. Can they be found in Census Records? I understand that Walter died at the Battle of Shiloh, Tennessee in 1862 where he was a Captain in the Confederate Cavalry. Is his grave known at Shiloh? Amy was serving in the same Mississippi Cavalry Regiment as her husband. She later joined the 11th Tennessee Infantry (Confederate)and was wounded and taken prisoner. She was later exchanged and seems to have dropped from sight. Any information would be of interest to me.