Editors. "The French capture Ambleteuse and begin the siege of Boulogne". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14794, accessed 22 May 2013.]
The French launch an attack on the English possessions in Calais. They successfully capture Ambleteuse and begin to besiege Boulogne.