 Complete the following phrase:  In the American Civil War, Geddes served in the Union army, enlisting as a private in the 8th Iowa Infantry. He was promoted to captain and then lieutet colonel, and after February 1862 as colonel of volunteers. He took part in the fighting at Shiloh, where he was wounded and captured. He was imprisoned for a time at Madison, Georgia, and in Libby Prison in Richmond, Virginia. After being exchanged, he fought at Vicksburg and 