On page 103 of Thompson's 1871 biography is stated, to wit:
"In the spring of '62, at Major Thompson's request, the regiment was transferred to Tennessee, and on its reorganization he was elected Lt Colonel."
On same page is his letter written to his father on night of April 4th from Monterrey, Putman county, a considerable distance to the east northeast of Shilo.
I gather they saw little to no combat for their months in Virginia and he was wanting action, but then who really knows?
Granted, we know many bios written of the period embellished the facts, if not made some up, even 'men of the cloth' such as this author.
Start of my article being prepared for Encyclopedia of Arkansas History and Culture:
"St Johns' College of Arkansas was the first state chartered institution of higher learning in Arkansas.
"This centrally located Masonic sponsored college ranked high among literary institutions of the Southwest and was Arkansas' premier educational facility! It occupied one-hundred acres of land in Pulaski county immediately east of United States Arsenal (now MacArthur park) purchased for $5,500 and is illustrated in upper left corner on 1870 Little Rock's, 'bird's eye view', with building 2nd from bottom left <http://photos.ark-ives.com/general/4543%5F67r.jpg>."