I'm on a mission to flesh out the Civil War service of my great-grandfather, Col. Edward Dillon (CSA) -- family writing history. From a Xeroxed photo my father had kept of McCulloch's staff, local library got me to a book, which got me to the info that he was on McCulloch's staff at Pea Ridge, which is almost enough to assure me that he's the one I suspect, in the photo. Figuring out these old photos is a challenge, though, especially when you're comparing a face from 1861-2 with same face from 1852 versus 1880s! All that facial hair! Hope I can learn from y'all!