Civil War Union Army Officer. He began his Civil War service with a commission of 2nd Lieutenant in Company C, 38th New York Volunteer Infantry, which was organized and recruited in New York City, New York. He received several promotions over the course of the next year (1st Lieutenant, August 6, 1861, Captain of Company H, January 11, 1862) before entering into combat when Army of the Potomac's commander, Major General George H. McClellan, launched his Spring 1862 Peninsular Campaign. He would be wounded in the army during the May 5, 1862 Battle of Williamsburg, and in the thigh during the August 1862 Battle of 2nd Bull Run. On December 4, 1862 he was discharged due to disability for those injuries, but he had recovered enough by the next month to apply to return to the Union Army. On January 19, 1863 he was appointed as Major of his original regiment, the 38th New York, and served with it until June of that year. He was appointed Colonel of the regiment on June 23, 1863, during the unit's re-organization after the original enlistment expired that month. The re-organization was discontinued in October 1863, leaving Augustus Funk without a regiment. That was remedied on November 13, 1863, when he was commissioned Colonel and commander of the 39th New York Volunteer Infantry. He would lead his new command through the end of the war, with occasional stints in command of his brigade, and receive two more wounds (left leg at the May 1864 Battle of the Wilderness and right hip at the March 1865 Battle of Boydton Plank Road, Virginia). After the fighting was all but over, he spent the last month of his enlistment in command of the 3rd Brigade of the I Division of the II Army Corps before being honorably mustered out on July 1, 1865. After the war he joined the Regular Army, serving as a 1st Lieutenant in the 41st Infantry regiment until he resigned on November 20, 1868. He then became a successful hotel keeper, and worked as a clerk in the United States Army's Adjutant General's office in Washington, DC.