They could possibly have enlisted in any of the Virginia regiments listed at:

http://www.bjmjr.com/virginia/index.htm

or escaped to Pennsylvania and enlisted in one or more of the regiments organized in that state:

http://www.bjmjr.com/civwar/north_states.htm

or maybe regiments organized in Maryland:

http://www.bjmjr.com/civwar/bord_states.htm