Looks like you got a virgin camp there boy! I've only found 1 big virgin camp before in the late 1990s and I wrote about it here
http://www.treasurenet.com/forums/general-discussion/335752-finding-civil-war-camp-sites.html the only reason know one else really found it was because the camp sits on the hill as you can tell in the photograph... Hit that camp of yours nice and slow and if they built huts in the camp you are hunting? more then likely most of the plates,buckles and even id tags,etc are in the huts but i know for a fact if the camp you are hunting had huts there is a buckle/plate or two in one of them...