The Battle of Oosterweel, traditionally regarded as the start of the Eighty Years' War, commences.
The Battle of Oosterweel took place on 13 March 1567 near the village of Oosterweel, near Antwerp, in present-day Belgium, and is traditionally seen as the beginning of the Eighty Years' War. A Spanish mercenary army surprised a band of rebels and killed or captured almost all of them.