 Complete the following phrase:  The 39th was tasked with guarding the Baltimore and Ohio Railroad. On January 2, 1862, the company met Major General Stonewall Jacksons Valley District Army 15,000 soldiers, but managed to retreat after a skirmish. Manns decision making during the retreat earned him a promotion to lieutet colonel. He served on the staff of General Alpheus S. Williams until leaving to join his regiment at the 