Siege of Groenlo

The siege of Groenlo was a 10-day siege of the Dutch town of Groenlo from 1 to 10 June 1672 by the combined forces of France, the Elector of Cologne and the Prince-Bishop of Münster during the Franco-Dutch War. It ended in the town's surrender.After the secret Treaty of Dover between France, England, the Prince-Bishop of Münster and the Archbishop of Cologne against the Dutch Republic, French troops passed through the possessions of Münster and Cologne and a few other French allies then the Spanish Netherlands, enabling them to by-pass the Dutch defences in the south and invade the Dutch from the east in June. Bernhard von Galen, bishop of Münster, invaded the Netherlands the on 1 June 1672 in several places, taking several towns and laying siege to Groenlo, where his forces were joined by those of France and Cologne.

Wikipedia