The French under François, Duke of Guise, capture Calais from England. The loss of Calais is regarded as a national disaster and provokes widespread distrust of Mary's Spanish marriage, so that all hopes of Philip II succeeding to the throne on Mary's death are dashed.
Citation:
Editors. "Calais captured by the French".
The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=10102, accessed 18 June 2013.]