Source: http://www.army.mil/cmh/Default.htm

Note: This is not my ancestry. I have NO additional information. I am just passing along information that may be useful.

SHIEL (SHIELDS), JOHN

Rank and organization: Corporal, Company E, 90th Pennsylvania Infantry. Place and date: At Fredericksburg, Va., 13 December 1862. Entered service at: Cressonville, Pa. Birth: ------. Date of issue: 21 January 1897. Citation: Carried a dangerously wounded comrade into the Union lines, thereby preventing his capture by the enemy.