Conversation so far:
where was the first major battle for african american troops in the union army
The Siege of Port Hudson was the first major battle where african american troops from the 1st Louisiana Native Guard fought.
can you tell me about the 1st Louisiana Native Guard
The 1st Louisiana Native Guard was one of the first all-black regiments to fight in the Union Army during the American Civil War.

Question: where was the guard based
Self-contained rewrite: where was the 1st Louisiana Native Guard based