This fort is in the town of Samboangan,[10] a separate jurisdiction with a chief magistrate, who is the governor of this military post. It is situated in the great island of Mindanao, near the promontory which is called Punta de la Caldera, in 7° 4′ north latitude, and 160° 30′ east longitude;[11] it is distant from the capital, Manila, 134½ leguas south by east, and four degrees to the east.
Plan of fort at Zamboanga, 1742
[Photographic facsimile from original MS. in Museo-Biblioteca de Ultramar, Madrid]
This fort is constructed of stone and mortar, with a terreplein, at the entrance of the town, on the sea-shore; the beach surrounds it on the eastern and southern sides, along which it has also, externally, a palisade. On the western side, where the gate is, it has a marsh for a moat; and on the northern side, which faces the dwellings, it has an artificial moat.
Its shape is that of a rectangle, with four full bastions—three with straight flanks, and one with an orillon; it has a circuit of 820 feet, and in it are enclosed the necessary buildings, as the plan shows.
The town has its own special fortifications; for on the eastern side it has a long curtain of palisades, in the midst of which there is a semicircular platform, which defends it. On the northern side there is a long curtain of stone and mortar, flanked at the east by a bastion with orillon, called Santa Cathalina; and at the west by a cavalier of rectangular shape, called Santa Barbara. This curtain has its palisade, which ends on the western side of this town, at some distance from the said cavalier; and the rest of this said side has some marshes for defense. The said wall and curtain of this town is surrounded by a canal, full of water, ten or twelve feet wide; and it connects with the said marshes.
The arms, supplies, and soldiers with which this military post is maintained and defended are stated in the following lists: