In July 1861, the United States Congress authorized President Abraham Lincoln to call out 500,000 men, to serve for three years unless sooner discharged. The 2nd Vermont Infantry was the first of the three years regiments from the state placed in the field as a result of this call, and it served longer in the service than all but one other Vermont unit, the 7th Vermont Infantry. It was organized from militia companies from Brattleboro, Burlington, Castleton, Fletcher, Ludlow, Montpelier, Tunbridge, Vergennes and Waterbury.