There's not much on the 18th. Here are a couple of sites. My GGF, Lemuel Boring, and Great Uncles Alexander N. and Francis A. Boring were in Co. A. Lemuel died at Seven Pines. Francis was wounded at Spotsylvania and captured in Georgia while on recuperative leave. Uncle Alex, 4th Sgt., was captured at Cedar Creek. Stan
http://www.robert-ford.ws/18th%20GA.htm
http://antietam.aotw.org/officers.php?unit_id=580
http://homepages.rootsweb.ancestry.com/~allenatk/history.html
http://homepages.rootsweb.ancestry.com/~allenatk/researchers.html
http://homepages.rootsweb.ancestry.com/~allenatk/lemon.html
http://files.usgwarchives.org/ga/cobb/military/biolemon.txt