I believe the 24th Georgia, led by Thomas Cobb and sometimes called "Cobb's Legion", as Wayne has pointed out, was in the Confederate line at the stone wall below Marye's Heights that day. The unit had a high proportion of Irishmen in its ranks. About 20,000 Irish volunteers fought for the Confederacy during the war. About 120-140,000 fought for the Union.
*SIGH!* Nice set, but you can NOT make a set of Union soldiers in gray plastic! It is just never done, even by the cheapo soldier companies. Sure "all silver all the time" Italeri did it, but eventually made Union in light blue & Confederate in gray. & yes, HAT made Union Zouaves in gray, but they could be used as Confederates, plus, thanks to Kent Sprecher, blue sets were available. Oh well, they'll look nice in my Confrdrtate army.