Editors. "Barrier Treaty is signed between Holland and the Empire". The Literary Encyclopedia. First published 01 April 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=17176, accessed 21 December 2013.]
A third Barrier Treaty is signed between Holland and the Empire, also known as the Treaty of Antwerp. By this agreement, the Empire secures the Spanish Netherlands, but the Dutch are permitted to occupy eight fortresses against the French, including several cities in Guelders.