First Things First:

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Mansion House was a hotel that became a hospital during the war.
Camp Convalescent was a hospital complex called "Camp Misery" by the soldiers.
L'Ouverture Hospital was a former pen for holding slaves awaiting sale that became a hospital for African American soldiers.
Think about it:

Look at the sites that are highlighted (marked). What function does the largest number of buildings serve? Why might that be?