Editors. "Spain raises the siege of Gibraltar". The Literary Encyclopedia. First published 01 April 2011; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=17323, accessed 25 April 2015.]
Spain has been besieging Gibraltar in response to Britain's attempt to blockade their colony of Porto Bello, but now they are forced by a peace agreement to raise the siege.
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