Detailed Instructions: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Q: Sentence: 'After Spain declared war against Great Britain in June of 1779 , Count Bernardo de G?lvez , the governor of Louisiana , seized three British Mississippi River outposts : Manchac , Baton Rouge , and Natchez .', Argument/Subject 1: 'spain', Argument/Subject 2: 'britain'
A:
declare war on