Between 1601 and 1627 Ambrogio Spinola is by far the most important general of the Spanish army. During the Siege of Ostend, which lasts from 1601 to 1604, Spinola provides not only his services, but also his money for this cause. These additional means are most welcome, for now he can pay his troops should the funds from Spain be delayed. Under his command the Spanish army recaptures Oldenzaal and Groenlo, and in 1625 even the most important fortified city, Breda.