Statistics for occurrence #1 of “Tunica Bayou” in chapter 48, regiment CDA1 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...ulf, to April, 1864. Assault on Port Hudson June 14, 1863. Surrender of Port Hudson July 9. Duty at Port Hudson, La., till April, 1864. Skirmish at Jackson August 3, 1863, and at Tunica Bayou November 8. Designation of Regiment changed to 73rd United States Colored Troops April 4, 1864 (which see).
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† Tunica Bayou (United States) 4 4 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.