 Complete the following phrase:  On November 18, 1861, at the age of 20, Thomas A. Anderson enrolled for military service at Wheeling, West Virginia. He then officially mustered in for duty with Company I of the 1st West Virginia Cavalry. Assigned to guard lines of the Baltimore and Ohio Railroad in what is now West Virginia during the opening months of 1862, Anderson and his fellow 1st Virginia Cavalrymen were directed to combat assignments beginning that spring. After fighting at Winchester, Virginia March 23, they engaged the enemy in operations at Monterey April 12, Buffalo Gap May 3, 