4th Regiment, Connecticut Infantry
The 4th Regiment, Connecticut Infantry was organized at Hartford, Connecticut. They were mustered in the 21st of May, 1861. It served as an Infantry regiment until January 2, 1862, when, the regiment was changed to Heavy Artillery. 
For more information on the history of this unit, see:
- The Civil War Archive section, 4th Regiment Infantry, (accessed 12 April 2012).
(For More information See 1st Regiment, Connecticut Heavy Artillery.)
Companies in this Regiment with the Counties of Origin
Men often enlisted in a company recruited in the counties where they lived though not always. After many battles, companies might be combined because so many men were killed or wounded. However if you are unsure which company your ancestor was in, try the company recruited in his county first.
- Adjutant General's Office, United States Army. Connecticut Infantry Regiment 1,2,3,4, and 5th. Catalogue of the 1st, 2d, 3d, 4th, and 5th regiments, Connecticut volunteers, 1861, (Bethesda, Maryland : University Publications of America, c1991). Available at the Family History Library, FHL US/CAN Fiche 6082888.
- Connecticut. Adjutant General's Office, Catalogue of Connecticut volunteer organizations, with additional enlistments and casualties to July 1, 1864, (Hartford, Connecticut : Case, Lockwood, 1864), page 117. Available Online at Internet Archive, (accessed 8 Mar 2011). Also available at the Family History Library, FHL US/CAN Book 974.6 M2a, or FHL US/CAN Film 1550802.
- Adjutant General's Office, 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, (Bethesda, Maryland : University Publications of America, c1991), page 130. Includes index. Online at Internet Archives, (accessed 8 Mar 2011). Also available at the Family History Library, FHL US/CAN Fiche 6082887. or FHL US/CAN Film 1033670 Item 1.
- Beginning United States Civil War Research gives steps for finding information about a Civil War soldier. It covers the major records that should be used. Additional records are described in ‘Connecticut in the Civil War’ and ‘United States Civil War, 1861 to 1865’ (see below).
- National Park Service, The Civil War Soldiers and Sailors System, is searchable by soldier's name and state. It contains basic facts about soldiers on both sides of the Civil War, a list of regiments, descriptions of significant battles, sources of the information, and suggestions for where to find additional information.
- Connecticut in the Civil War describes many Confederate and Union sources, specifically for Connecticut, and how to find them.. These include compiled service records, pension records, rosters, cemetery records, Internet databases, published books, etc.
- United States Civil War, 1861 to 1865 describes and explains United States and Confederate States records, rather than state records, and how to find them. These include veterans’ censuses, compiled service records, pension records, rosters, cemetery records, Internet databases, published books, etc.
- Footnote.com, (accessed 2 Apr 2011). (A subscription website, but is available for use at the Family History Library and some Family History Centers). It has digital Civil War soldier service records and brief regiment histories (located at the bottom of some of the muster rolls).
- The Civil War in the East, (accessed 8 Mar 2011). Timeline of the 4th Connecticut Infantry Regiment
- National Park Service, The Civil War Soldiers and Sailors System, (accessed 6 December 2010.