After dealing with Orange's threat in the South, Alba sent his son Fadrique to the two rebellious provinces Gelderland and Holland. Fadrique started his campaign by sacking the fortress city of Zutphen in Gelderland. Hundreds of citizens perished and many rebellious cities in Gelderland, Overijssel, and Friesland yielded. On his way to Amsterdam, Fadrique came across Naarden and massacred the population on 22 November 1572. In Haarlem the citizens, aware of the fate of Naarden, prevented capitulation and put up a resistance. The city was under siege from December until 13 July 1573, when starvation forced a surrender. The Siege of Alkmaar resulted in a rebel victory after they inundated the surroundings.