Frederick Andrea was from Luzerne County, Pennsylvania (the family name is also recorded as Andrie, Andres, and Andreas). On April 23, 1861, Andrea mustered into service as a musician in Co. G, 8th Pennsylvania Infantry, a three-month regiment that performed guard duty along the Potomac before it was mustered out on July 29, 1861. Despite noting that he did not intend to serve longer than three months, he enlisted in Co. I, 98th Pennsylvania Infantry on August 23, 1861. He was wounded at the Battle of Cold Harbor on June 3, 1864 and was discharged at the end of his enlistment on September 5, 1864. Frederick’s younger brother, Jacob, mustered into service with the 9th Pennsylvania Cavalry in May 1864 and mustered out in July 1865. Frederick Andrea’s German ancestry comes through in some of the language of the letter.