Reuben Bailey's records show he was killed at Gaines Cross Roads, Va., on July 24, 1863. This was a fairly small skirmish variously called "Battle Mountain" or "Thornton River," as Lee's army made the final stages of its retreat from Gettysburg, from the Blue Ridge to Culpeper area. The operators of this site can provide you with his entire Compiled Military Service record ("CMSR") - I don't recall how detailed his CMSR is, some solders' have lots of information on them, some don't.
There is some info on Gaines crossroads at my website with the material on the Gettysburg campaign. It was written several years ago and off the top of my head I don't remember how I referred to it
Best Regards,
Andrew Johnson
benningsbrigade@comcast.net