Editors. "John Frederick of Saxony recovers his lands from Maurice". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14748, accessed 18 April 2014.]
In October, following a secret treaty, Emperor Charles V had formally re-assigned the electorate of Saxony from John Frederick to Duke Maurice. Now, however, John Frederick uses military force to regain his Ernestine Saxon lands, and invades the Albertine lands of Duke Maurice.