Siege of Breda (1637) when word came that the Dutch had suddenly invested the city of Breda with a besieging army of 18,000. Breda was the capital city of the baronial fief that had once been the crown jewel in the Dutch estates of the Nassau family in the Habsburg Netherlands before the war started. Frederick Henry had therefore a personal interest in recapturing the city and its surroundings. The siege was preceded by an attempt to surprise the garrison on 21 July 1637 by Dutch cavalry under Henry Casimir I of Nassau-Dietz. However, the gates were closed in time and the Dutch skirmishers
Breda surrendered to the Spaniards, now led by Spinola; the event was immortalized by Diego Velázquez. In the Siege of Breda of 1637 the city was recaptured by Frederick Henry, Prince of Orange, after a four-month siege, and in 1648 it was finally ceded to the Dutch Republic by the Treaty of Westphalia. In 1646, Frederick Henry founded the Orange College of Breda, modelled on Saumur, Geneva, and Oxford, intending it to train young men of good family for the army and the civil service. The exiled Stuart Charles II of England resided in Breda during most of his exile during