"being made commander in consequence of the action off St. Domingo"

Santo Domingo, the founding city on the island Columbus named Hispaniola, changed hands quite a few times in the early 19th century. 


Hispaniola 1671
Public DomainHispaniola 1671 - Credit: wikimedia commons

It was a city integral to colonial interests in the West Indies and a destination of great value to pirates and buccaneers.  When Austen's Captain Wentworth joined battle there (c. 1806) it was in French hands. 

 Santo Domingo is now part of the Dominican Republic.