volucrem cum decipit auceps."

According to the advice early given by the Prince of Orange, the citizens
had taken an account of their provisions of all kinds, including the live
stock. By the end of June, the city was placed on a strict allowance of
food, all the provisions being purchased by the authorities at an
equitable price. Half a pound of meat and half a pound of bread was
allotted to a full grown man, and to the rest, a due proportion. The city
being strictly invested, no communication, save by carrier pigeons, and
by a few swift and skilful messengers called jumpers, was possible.
Sorties and fierce combats were, however, of daily occurrence, and a
handsome bounty was offered to any man who brought into the city gates
the head of a Spaniard. The reward was paid many times, but the
population was becoming so excited and so apt, that the authorities felt
it dangerous to permit the continuance of these conflicts. Lest the city,
little by little, should lose its few disciplined defenders, it was now
proclaimed, by sound of church bell, that in future no man should leave
the gates.

The Prince had his head-quarters at Delft and at Rotterdam. Between those
two cities, an important fortress, called Polderwaert, secured him in the
control of the alluvial quadrangle, watered on two sides by the Yssel and
the Meuse. On the 29th June, the Spaniards, feeling its value, had made
an unsuccessful effort to carry this fort by storm. They had been beaten
off, with the loss of several hundred men, the Prince remaining in
possession of the position, from which alone he could hope to relieve
Leyden. He still held in his hand the keys with which he could unlock the
ocean gates and let the waters in upon the land, and he had long been
convinced that nothing could save the city but to break the dykes. Leyden
was not upon the sea, but he could send the sea to. Leyden, although an
army fit to encounter the besieging force under Valdez could not be
levied. The battle of Mookerheyde had, for the present, quite settled
the question, of land relief, but it was possible to besiege the
besiegers, with the waves of the ocean. The Spaniards occupied the coast
from the Hague to Vlaardingen, but the dykes along the Meuse and Yssel
were in possession of the Prince. He determined, that these should be
pierced, while, at the same time, the great sluices at Rotterdam,
Schiedam, and Delftshaven should be opened. The damage to the fields,
villages,