Editors. "Grosswardern, Transylvania, surrenders to the Turks". The Literary Encyclopedia. First published 01 April 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16463, accessed 24 May 2013.]
Grosswardern (today's Oradea), Transylvania, surrenders to the Ottoman Turks. In the wake of this victory, Holy Roman Emperor Leopold I agrees to send army to try to check the Turkish advance.