Editors. "Imperial force besieges the fortress of Jülich". The Literary Encyclopedia. First published 01 February 2011; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15668, accessed 28 April 2015.]
Archduke Leopold of Austria lays siege to the fortress of Jülich on behalf of Holy Roman Emperor Rudolf II, who is attempting to claim the Duchy for his own.
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