William the Silent, Prince of Orange, persuades the Estates of Holland to open the dykes as an obstacle against the Spanish siege of Leyden.
Editors. "Middelburg captured by the Dutch; Spanish relinquish their siege of Leiden". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=10177, accessed 01 April 2015.]