Friso-Hollandic Wars: Frisians defeat Holland in the Battle of Warns.

The Battle of Warns was a battle of the Friso-Hollandic Wars between Count William IV of Holland and the Frisians which took place on 26 September 1345. The annual commemoration of the battle is important for many nationalist Frisians. The Frisians won the battle and repelled the 'Hollanders' from the eastern coast of the Zuiderzee.