Grutte Pier, battle of Warns

The Battle of Warns was a battle in the Frisian-Dutch wars between Count William IV of Holland and the Frisians on Sept. 26, 1345. It ended with a victory for the Frisians and the death of the count. For part of the Frisians, the annual commemoration of the battle is important. It is also referred to as the Battle of Stavoren, which is more correct since Warns is not mentioned in historical sources.

Source: wikipedia

In 1345, the Frisians defeated the Dutch at Warns, during the so-called Battle of Warns. Four in ten Frisians think Grutte Pier was involved in this battle, but the iconic freedom fighter was not yet born at the time.