I found this record:
Name: Andrew Trego
Rank: P.
Company: I
Regiment: 155
State: Ohio
Arm of service: Infantry
Event date: 1882
State/Arm service: Ohio Inf.
Company/Regiment: I,155
Publication title: Organization Index to Pension Files of Veterans Who Served Between 1861 and 1900
NARA publication number: T289
Publisher: National Archives and Records Administration
Collection title: Civil War Pensions
Collection: Civil War Pension Index Cards
American Civil War Soldiers
about Andrew Trego
Name: Andrew Trego
Enlistment Date: 2 May 1864
Side Served: Union
State Served: Ohio
Service Record: Enlisted as a Private on 2 May 1864 at the age of 34.
Enlisted in Company I, 155th Infantry Regiment Ohio on 8 May 1864.
Mustered Out Company I, 155th Infantry Regiment Ohio on 27 Aug 1864 at Camp Dennison, OH.
Sources: 17
U.S. Civil War Soldier Records and Profiles
about Andrew Trego
Name: Andrew Trego
Age at Enlistment: 34
Enlistment Date: 5 Feb 1864
Rank at enlistment: Private
State Served: Ohio
Survived the War?: Yes
Service Record: Enlisted in Company I, Ohio 155th Infantry Regiment on 08 May 1864.
Mustered out on 27 Aug 1864 at Camp Dennison, OH.
Birth Date: abt 1830
Sources: Official Roster of the Soldiers of the State of Ohio
I know not if could be possible to find more by this infos; more:
1870 United States Federal Census
about Andrew Frigo
Name: Andrew Frigo
Estimated Birth Year: abt 1829
Age in 1870: 41
Birthplace: Ohio
Home in 1870: Perry, Pickaway, Ohio
Race: White
Gender: Male
Value of real estate: View image
Post Office: Circleville
Household Members: Name Age
Andrew Frigo 41
Phebe Frigo 40
James Frigo 29
William Frigo 16
Mary Frigo 13
Charles Frigo 8
Elizabeth Jones 73
http://s6.imagestime.com/out.php/i402820_1870trego.jpg
maybe helpful,
suanj