Then I guess you wouldn't have a problem with Cuba bombarding Gitmo into surrender. That wouldn't be cause for war at all.
Frankly, I wouldn't have been surprised if Castro had tried to take over Gitmo. Of course he didn't because he didn't have a chance.
http://www.nsgtmo.navy.mil/gazette/History_98-64/hischp3.htm
http://www.u-s-history.com/pages/h98.html