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.
Citation:
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 20 May 2013.]