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 3rd Vermont Infantry was the second of the three years regiments from the state placed in the field as a result of this call. It was organized from militia companies from Springfield, Coventry, Newbury (Wells River), Charleston, Johnson, Hartford, St.Johnsbury, St. Albans, Guidhall, and East Montpelier and Calais. The history of the regiment from this point on is essentially that of the Vermont Brigade.