Alva had his enemies at the Spanish court, always ready to excite
distrust against the duke in the mind of the suspicious king. In July,
1572, the Duke of Medina-Coeli had been sent from Spain to enquire into
the state of affairs in the Netherlands; probably it was intended that
he should take over the administration and supersede the
governor-general. On his arrival, however, Medina-Coeli quickly saw that
the difficulties of the situation required a stronger hand than his, and
he did not attempt to interfere with Alva's continued exercise of
supreme authority. The governor-general, on his side, knew well what was
the meaning of this mission of Medina-Coeli, and no sooner was the army
of Orange dispersed than he determined, while the reins of power were
still in his hands, to visit the rebellious towns of the north with
condign vengeance.

At the head of a powerful force, Frederick of Toledo marched northwards.
Mechlin, which had received Orange, was given over for three days to
pillage and outrage. Then Zutphen was taken and sacked. Naarden, which
had, though without regular defences, dared to resist the Spaniards, was
utterly destroyed and the entire population massacred. Amsterdam, one of
the few towns of Holland which had remained loyal to the king, served as
a basis for further operations. Although it was already December and the
season was unfavourable, Toledo now determined to lay siege to the
important town of Haarlem. Haarlem was difficult of approach. It was
protected on two sides by broad sheets of shallow water, the Haarlem
lake and the estuary of the Y, divided from one another by a narrow neck
of land. On another side was a thick wood. It was garrisoned by 4000
men, stern Calvinists, under the resolute leadership of Ripperda and
Lancelot Brederode. An attempt to storm the place (December 21) was
beaten off with heavy loss to the assailants; so Toledo, despite the