21st Regiment, Connecticut Infantry
- Mustered in September 5, 1862.
- Mustered out June 16, 1865.
- Organized at Norwich.
- Regimental History - The Story of the Twenty-First Regiment, Connecticut Volunteer Infantry during the Civil War, by members of the regiment - Online book
The regiment was composed of men from all parts of Connecticut, but the majority of men in each unit resided in the following counties:
Company B - Hartford County
Company C - New London County
Company E - New London County
Company F - New London County
Company G - New London County
Company H - New London County
Company I - Middlesex County
Company K - Windham County
- Catalogue of Connecticut volunteer organizations, with additional enlistments and casualties to July 1, 1864. Compiled From Records in the Adjutant General's Office and Published by Order of the Legislature, by Horace J. Morse - Adjutant General - Online Book
- Catalogue of Connecticut volunteer organizations : (infantry, cavalry, and artillery,) in the service of the United States, 1861-1865, with additional enlistments, casualties, &c., &c., and brief summaries, showing the operations and service of the several regiments and batteries (1869) by Connecticut. Adjutant-General's Office; Ingersoll, Colin M. (Colin Macrae), 1819-1904 - Online Book
- Regimental Timeline - 21st Connecticut Infantry Regiment - The Civil War in the East