This has taken me longer than I realized! I'm so sorry!
William Agg became a citizen of the U.S. on May 4, 1869. He was a private in the Union Army, serving in Capt. Paices, Company 6, 97th Regiment, Pennsylvania Volunteers.He enlisted on 9/16/1861 and was honorably discharged on 3/20/1865. He was married to Elvira T Esten on 10/30/1867. He received a gunshot wound on 8/29/1864 while engaged in military action. He never fully recovered from the wound. He passed away on 8/18/1883, leaving two sons, William E. Agg (born 1/11872) and Arthur B. Agg (born 6/15/1876). He was born in England.
I got my information from his citizenship papers and his widow's pension application.