 The Dutch garrison led by Captain Maerten Cobben, expecting to be aided by Maurice's army, held out for nine days, but were finally forced to surrender.The siege was part of Spinola's successful campaign of 1605-1606.After the devastating Siege of Ostend, on 2 July 1605, the Dutch headquarters received reports that Don Ambrosio Spinola with Spain's main army of Flanders was headed towards the strongholds of the Rhine, in Cologne.