Editors. "Henry III gains Swiss mercenaries for defence against Catholic League". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15371, accessed 18 December 2013.]
Henry III calls for a force of Swiss mercenaries, under the command of the Duke of Biron, to defend the suburbs of Paris against the advance of the Catholic League. In response to this apparently invading army, the Parisians send for the head of the League, the Duke of Guise.