Editors. "The Duke of Biron is sent with a substantial army to lay siege to Amiens". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15510, accessed 25 April 2014.]
Henry IV of France sends the Duke of Biron with a sizeable army to lay siege to Amiens, which has just been captured by the Spanish.