Statistics for occurrence #1 of “St. Louis, Mo.” in chapter 2 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...January, 1864, and Post duty there till March. Designation of Regiment changed to 54th U. S. Colored Troops March 11, 1864, which see. Organization not completed. Organized at St. Louis, Mo. , August 12, 1863. Attached to District of Eastern Arkansas, Dept. Arkansas, to January, 1864. Little Rock, Ark., 7th Army Corps, Dept. Ark., to March, 1864. Ordered to Helena, Ark., ...
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