 On September 21, the regiment, 1048 men strong, was mustered into Federal service, left that evening and arrived in Washington, D.C. the evening of September 23, and went into camp on Capitol Hill.Four days later, the regiment marched to the Chain Bridge, where it joined the 2nd, 3rd and 5th regiments.On October 9, the Vermont regiments moved to Camp Griffin, about four miles from Chain Bridge.