At the outbreak of the
Civil War, he joined up with a company of volunteers for the Union Army, known as the "La Crosse Light Guard". His company became Company B in the
2nd Wisconsin Infantry Regiment, and mustered into federal service on April 12, 1861. He was wounded at the
First Battle of Bull Run, and was discharged due to those wounds in December. After recovering from his wounds, he volunteered again and was commissioned
adjutant of the
25th Wisconsin Infantry Regiment. After one year as adjutant, he was promoted to captain of Company F in that regiment. With the 25th Wisconsin Infantry, he participated in the
Siege of Vicksburg and the
Atlanta campaign. He was wounded again at
Decatur, Georgia, in July 1864. While recuperating, he was offered the command of the new
44th Wisconsin Infantry Regiment and accepted. He returned to Wisconsin to assist in organizing the new regiment. The 44th Wisconsin Infantry was called to service before fully organized, and five companies were sent forward under their lieutenant colonel in November 1864. Symes completed the organization of the regiment and joined the advance battalion at
Nashville, Tennessee, in February 1865. They spent the remainder of the war on guard duty in Tennessee and Kentucky. ==Political career==