This is all I can find I hope it will help.
If you will go to the Connecticut Historical Society web. Site, your looking for the Civil War Manuscripts Project and write them they have this info on him, could lead you in the right direction.

Russell, George D. (b.ca.1831)
Captain
Derby
Second Connecticut Infantry, Infantry Company D
1860-1861
1 Folder
Military papers and orderly book. The orderly book, October 1860-April 1861, contains the records of the 2nd Regiment Connecticut Militia, Company C, which became Company D, 2nd Connecticut Infantry (commanded by Colonel Alfred Terry and mustered-into service 7 May 1861 for a term of three months). On 19 April 1861, it was noted, "Resolved that we Telegraph to Brooks Brothers to send a Cutter up to Measure the Company --" Collection also contains the military papers of Captain Russell including his Captain's commission and his discharge; muster roll, relating name of soldier, rank, age, where, when and by whom enlisted, and term of service; returns; discharge of Private James B. Whipple; Mrs. Russell's pass allowing her to visit her husband's camp, dated 15 June 1861; an "At Home" card to Captain Russell from Secretary of State and Mrs. Seward, dated 6 June [1861]; regimental orders; photograph of Captain George Russell; and an 1860 "Roster of the Connecticut Militia." Russell enlisted on 23 April 1861 and was mustered-in on 7 May 1861. He was mustered-out of his three-months unit on 7 August 1861.
Location: MS Militia Papers, Box I