Editors. "Empire declares war on Prussia". The Literary Encyclopedia. First published 30 December 2011; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=17702, accessed 25 April 2015.]
The Holy Roman Empire declares war on Prussia. This international power is later joined in opposition to Prussia by Russia, Poland and Sweden.
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