principal director of the operations. He had been despatched thither by
the Prince of Orange, to serve under La None, who was to have commanded
in Maestricht, but had been unable to enter the city. Feeling that the
siege was to be a close one, and knowing how much depended upon the
issue, Sebastian lost no time in making every needful preparation for
coming events. The walls were strengthened everywhere; shafts were sunk,
preparatory to the countermining operations which were soon to become
necessary; the moat was deepened and cleared, and the forts near the
gates were put in thorough repair. On the other hand, Alexander had
encircled the city, and had thrown two bridges, well fortified, across
the river. There were six gates to the town, each provided with
ravelins, and there was a doubt in what direction the first attack should
be made. Opinions wavered between the gate of Bois-le-Duc, next the
river, and that of Tongres on the south-western side, but it was finally
decided to attempt the gate of Tongres.

Over against that point the platforms were accordingly constructed, and
after a heavy cannonade from forty-six great guns continued for several
days, it was thought, by the 25th of March, that an impression had been
made upon the city. A portion of the brick curtain had crumbled, but
through the breach was seen a massive terreplein, well moated, which,
after six thousand shots already delivered on the outer wall--still
remained uninjured. It was recognized that the gate of Tongres was not
the most assailable, but rather the strongest portion of the defences,
and Alexander therefore determined to shift his batteries to the gate of
Bois-le-Duc. At the same time, the attempt upon that of Tongres was to
be varied, but not abandoned. Four thousand miners, who had passed half
their lives in burrowing for coal in that anthracite region, had been
furnished by the Bishop of Liege, and this force was now set to their
subterranean work. A mine having been opened at a distance, the