the unit was mustered into federal service between 8–18 may 1898 at new orleans as the 1st louisiana volunteer infantry and mustered out of federal service on 3 october 1898 at jacksonville, fl. it was reorganized on 8 august 1899 in the louisiana state national guard as the 1st battalion of infantry with headquarters at monroe. it was expanded, reorganized, and redesignated on 6 december 1904 as the 1st regiment of infantry with headquarters at monroe. the louisiana state national guard was meanwhile redesignated in 1910 as the louisiana national guard.