Editors. "League of Heilbronn". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16058, accessed 17 April 2014.]
Protestants in south Germany - in the Circles of Swabia, Franconia and the Upper and Lower Rhine - form the League of Heilbronn with Sweden and France, an agreement aimed at mutual support against the Emperor and the Catholic League.