we found this AG BROWN last night Corp Co H 1st reg CAV Reserves at the top of the card it says Mississippi, the card can be seen here

https://www.facebook.com/photo.php?fbid=10200963252831211&set=gm.340175139419176&type=1&theater

Does anyone see where this soldier served? and died? Birth Year? See other post on AG Brown, we are trying to figure out who a stone found in the swamp belongs to