No company designations/Field & Staff
3rd Infantry Regiment [also called 2nd Regiment] was organized near Springfield, Missouri, in January, 1862. Many of the men were from St. Louis and Jefferson and Franklin counties. The unit soon moved east of the Mississippi River and was active in the engagements at luka and Corinth. Later it was assigned to Bowen's Brigade, Department of Mississippi and East Louisiana. The 3rd fought in various conflicts during the Vicksburg siege and was captured on July 4, 1863. Exchanged and assigned to General Cockrell's Brigade, it was consolidated with the 5th Regiment. This command participated in the Atlanta Campaign, endured Hood's winter operations in Tennessee, then aided in the defense of Mobile. The 3rd lost 5 killed, 65 wounded, and 23 missing at Corinth, had 13 killed, 63 wounded, and 44 missing at Champion's Hill, and during the Vicksburg siege had 18 killed and 83 wounded. In the Atlanta Campaign, May 18 to September 5, the 3rd/5th reported 128 casualties and 68 at Altoona. Very few surrendered in May, 1865. Its commanders were Colonels William R. Gause, James A. Prichard, and Benjamin A. Rives; Lieutenant Colonels Finley L. Hubbell and James K. McDowell, and Major Robert J. Williams.