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.
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 30 August 2015.]