e at last
obtained the grant of two smaller vessels, from seventy to eighty tons,
with a number of flat-bottomed boats. With these two vessels, one of
which he called the "Fortune" and the other the "Hope," he proceeded in
the following manner: In the hold of each he built a hollow chamber of
freestone, five feet broad, three and a half high, and forty long. This
magazine he filled with sixty hundredweight of the finest priming powder
of his own compounding, and covered it with as heavy a weight of large
slabs and millstones as the vessels could carry. Over these he further
added a roof of similar stones, which ran up to a point and projected
six feet above the ship's side. The deck itself was crammed with iron
chains and hooks, knives, nails, and other destructive missiles; the
remaining space, which was not occupied by the magazine, was likewise
filled up with planks. Several small apertures were left in the chamber
for the matches which were to set fire to the mine. For greater
certainty he had also contrived a piece of mechanism which, after the
lapse of a given time, would strike out sparks, and even if the matches
failed would set the ship on fire. To delude the enemy into a belief
that these machines were only intended to set the bridge on fire, a
composition of brimstone and pitch was placed in the top, which could
burn a whole hour. And still further to divert the enemy's attention
from the proper seat of danger, he also prepared thirty-two flatbottomed
boats, upon which there were only fireworks burning, and whose sole
object was to deceive the enemy. These fire-ships were to be sent down
upon the bridge in four separate squadrons, at intervals of half an
hour, and keep the enemy incessantly engaged for two whole hours, so
that, tired of firing and wearied by vain expectation, they might at
last relax their vigilance before the real fire-ships came. In addition
to all this he also despatched a few vessels in which powder was
concealed in order to blow up the floating work before the bridge, and
to clear a passage for the two principal ships. At the same time he
hoped by this preliminary attack to engage the enemy's attention, to
draw them out, and expose them to the full deadly effect of the volcano.

The night between the 4th and 5th of April was fixed for the execution
of this great undertaking. An obscure rumor of it had already diffused
itself through the Spanish camp, and particularly from the circumstance