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Answer:
The Siege of Port Hudson, Louisiana (May 22 – July 9, 1863), was the final engagement in the Union campaign to recapture the Mississippi River in the American Civil War. ... When his assault failed, Banks settled into a 48-day siege, the longest in US military history.
Explanation:
End date: July 9, 1863
Combatants: Union
Part of: American Civil War