3. The towns of Manila and Cavite ought to be placed [in a condition of defense] with the plan of fortifications in the modern style which shall be furnished by the engineers who may be consulted, or may come from España, for this purpose. This expense will be very great, as is naturally obvious; and perhaps with the same expenditure the entrance of the bay could be fortified to prevent the entrance of ships and leave this place in a condition conformable thereto--devoting all attention to the said entrance and to the port of Cavite (in which the courts, the [royal] offices, the storehouses, etc, ought to be), because its situation, aided by art, will make the said port impregnable, and its maintenance less costly and more secure. 4. The town of Manila is of no use without the port of Cavite; and the latter, without the former, is more useful and less costly. Any enemy who attempts to capture this town [of Manila] can secure the same advantages by seizing other lands on the shores of the bay, because all is alike, but useless, without the said port; and the expedient of abandoning this town (which, on account of its uselessness, does not merit the expenditure of so much money), and employing the same expense in fortifying, if that can be done, the entrance of Mariveles, is more advantageous and safe, and less costly. It is more advantageous, because then no vessel can enter the bay, to invade the villages along its shore, as the Moros now do; more safe, because while any [hostile] squadron would be wasting time in opening a passage by which to find entrance into the bay and lay siege to Cavite, opportunity would thus be given for various military measures which would render difficult the capture of the said port; and less costly, because not so many soldiers are necessary to guard the fortifications of the said entrance and port as to man the great extent of the walls of Manila--which, according to intelligent persons, needs a garrison of at least three thousand men. [127] 5. There is a sort of flat boats which are called "floating bastions" [baluartes en el agua]; they are of shallow keel, but of a strength which can support artillery of large caliber. This is a most admirable invention for defending the entrances of ports; those who understand the subject will give more minute information regarding these vessels, which, added to the fortification of the aforesaid entrance [of Mariveles], will make it impossible for hostile ships to enter the bay. 6. There is no doubt that Manila, as I have said, is unnecessary if Cavite is well fortified; but it is also certain that at Manila it is easier to bring in supplies, and for all the troops and the citizens to remove, with their property, to the provinces, where the enemy cannot attack them. These reflections, and the difficulties which there may be in fortifying the entrance to the bay, will be better foreseen by those who understand the subject.