How was the siege of Leiden lifted in 1574?

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history of the Netherlands Flag of the Netherlands.

The siege of Leiden, which took place from May to October 1574 during the Dutch revolt against Spain, was lifted through a strategic decision to flood the surrounding countryside.12

To break the Spanish blockade, the Dutch forces cut the dikes, allowing the sea to flood the land. This deliberate inundation enabled Dutch ships to navigate the flooded terrain and carry essential provisions to the starving townspeople, ultimately forcing the Spanish to abandon the siege.12

In recognition of the citizens' bravery and resilience during this ordeal, William I (the Silent) founded the University of Leiden in 1575.12