Civil War Hutsite Digging

[diggerbob]

I have most recently read several articles on civil war relic hunting where they were digging hutsites at civil war campsites. I was wondering if anybody out there could give me some pointers or articles to read that would help with the ease of locating these hutsites. I would assume that no matter where the soldiers camped that it would probably be standard practice to dig these. I have several campsites that I have been hunting for the past 10+ years (and still find an occasional target) but I know that these hutsites should exist here. As far as I can tell, nobody in this area and at these campsites have done any excavating. I would like to make locating a hutsite a little easier as not to dig a bunch of holes all over the field. Any help would be appreciated!
Thanks in advance.
Diggerbob