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
The Surrender of Breda a “crown” of princes and officers of high birth. The governor then presented himself with his family, kinsfolk and distinguished students of the military academy, who had been shut up in the place during the siege. Spinola greeted and embraced his vanquished opponent with a kindly expression and still more kindly words, in which praised the courage and endurance of the protracted defense. The extraordinary respect and dignity Spinola demonstrated towards the Dutch army is praised through "The Surrender of Breda." Spinola “had forbidden his troops to jeer at, or otherwise abuse the vanquished Dutch, and, according to a contemporary