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.
Citation:
Editors. "Spain raises the siege of Gibraltar".
The Literary Encyclopedia. First published 01 April 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=17323, accessed 24 May 2013.]