There's an "Augustus Croft" at the link posted by cw0909:
Entry first, followed by details on 155th deployments (below).
Note the 155th was at New Creek and Martinsburg, WV - which may explain how it came to be in a West Virginia auction.
Croft , Augustus
Battle Unit Name:155th Regiment, Ohio Infantry (National Guard)
Side:Union
Company

Soldier's Rank In:Private
Soldier's Rank Out:Private
Alternate name:
Film Number:M552 ROLL 23
Plaque Number:
Notes: none
155th Regiment, Ohio Infantry (National Guard)
Overview: Organized at Camp Dennison, Ohio, and mustered in May 8, 1864. Left State for New Creek, W. Va., May 9; thence moved to Martinsburg. Attached to Reserve Division, West Virginia, to June. Moved to Washington, D. C., June 3; thence to Bermuda Hundred and City Point, Va. Ordered to Norfolk, Va., June 29, and duty there till August 19. Expedition to Elizabeth City, N. C., July 27-August 4. Ordered home for muster out August 19. Mustered out August 27.
Regiment lost during service 20 Enlisted men by disease.
Soldiers:View Battle Unit's Soldiers »