ohn Myers may be your man. However, there are some 100 John Myers listed as Union soldiers from Pennsylvania. There is no easy way to find him as only one of the hundred is listed as having been a prisoner.

1860 United States Federal Census

Name: Charles Myers
Age: 1
Birth Year: abt 1859
Gender: Male
Birth Place: Pennsylvania
Home in 1860: Philadelphia Ward 18 North East Division, Philadelphia, Pennsylvania
Post Office: Kensington
Household Members:
Name Age
Charles Read 52
Letitia Read 52
Theo Read 22
John Read 16
John Myers 25
Ezekia Myers 21
Charles Myers 1