 Complete the following phrase:  At the beginning of the Civil War, Hays re-entered the service as colonel of the 63rd Pennsylvania Volunteer Infantry Regiment, also holding the rank of captain in the 16th U.S. Infantry in the regular army to date from May 14, 1861. His men knew him to be as brave as a lion. During the Peninsula Campaign, he was attached with his regiment to the first brigade of Kearnys division of Heintzelmans III Corps. He fought in the battles of Yorktown, Williamsburg, Seven Pines, Savages Station, and 