|June||Organized under the command of Lieutenant Colonel John Pegram.|
|July 1||Transferred to Confederate service and assigned to Garnett’s Brigade.|
|July 7||Middle Fork Bridge|
Battle of Rich Mountain
Lieutenant Colonel Pegram surrendered the regiment. Companies G and H were disbanded while on parole.
|September 10||The regiment was released from parole.
Companies A-E were disbanded per Special Orders #270.
Company F was transferred to the 57th Virginia Infantry Regiment as its Company A.
Companies I and K were transferred to the 4th Virginia Infantry Battalion.
Lieutenant Colonel continued to be imprisoned at Fort Warren in Boston Harbor. He would be released in January.
Lieutenant Colonel James R. Crenshaw took command of the remnants of the regiment with Major Nathaniel Tyler as second in command.
|December 10||The 4th Virginia Infantry Battalion failed to complete its organization. Companies I and K continued as the remnant of the 20th Virginia Infantry.|
|May 9||Companies I and K transferred to the 59th Virginia Infantry Regiment as Companies D and F.|
|September||Companies I and K transferred returned from the 59th Virginia Infantry Regiment|
|October 27||Companies I and K returned to the 59th Virginia Infantry Regiment as Companies B and C.|