The 131st Illinois Infantry was organized at Old Fort Massac, Illinois, and mustered into Federal service on November 13, 1862, for a three-year enlistment.
Illinois. Report of the Adjutant General of the State of Illinois. Springfield, Ill: Phillips Bros, 1900. OCLC69691325
Lester, Robert, and Gary Hoag. Civil War Unit Histories [Part 4], The Union, Midwest and West. Bethesda, Md: University Publications of America, 1994. OCLC31265675
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