During the protracted struggle with the Mahometans, Zamboanga (Mindanao Is.) was fortified, and became the headquarters of the Spaniards in the south. After Cavite it was the chief naval station, and a penitentiary was also established there. [58] Its maintenance was a great burden to the Treasury--its existence a great eyesore to the enemy, whose hostility was much inflamed thereby. About the year 1635 its abandonment was proposed by the military party, who described it as only a sepulchre for Spaniards. The Jesuits, however, urged its continuance, as it suited their interests to have material support close at hand, and their influence prevailed in Manila bureaucratic centres. In 1738 the fixed annual expenses of Zamboanga fort and equipment were 17,500 pesos, and the incidental disbursements were estimated at 7,500 pesos. These sums did not include the cost of scores of armed fleets which, at enormous expense, were sent out against the Mahometans to little purpose. Each new (Zamboanga) Governor of a martial spirit, and desiring to do something to establish or confirm his fame for prowess, seemed to regard it as a kind of duty to premise the quelling of imaginary troubles in Sulu and Mindanao. Some, with less patriotism than selfishness, found a ready excuse for filling their own pockets by the proceeds of warfare, in making feigned efforts to rescue captives. It may be observed, in extenuation, that, in those days, the Spaniards believed from their birth that none but a Christian had rights, whilst some were deluded by a conscientious impression that they were executing a high mission; myth as it was, it at least served to give them courage in their perilous undertakings. Peace was made and broken over and over again. Spanish forts were at times established in Sulu, and afterwards demolished. Every decade brought new devices to control the desperate foe. Several Governors-General headed the troops in person against the Mahometans with temporary success, but without any lasting effect, and almost every new Governor made a solemn treaty with one powerful chief or another, which was respected only as long as it suited both parties. This continued campaign, the details of which are too prolix for insertion here, may be qualified as a religious war, for Roman Catholic priests took an active part in the operations with the same ardent passion as the Mahometans themselves. Among these tonsured warriors who acquired great fame _out_ of their profession may be mentioned Father Ducos, the son of a Colonel, Jose Villanueva, and Pedro de San Agustin, the last being known, with dread, by the Mahometans in the beginning of the 17th century under the title of the Captain-priest. One of the most renowned kings in Mindanao was Cachil Corralat, an astute, far-seeing chieftain, who ably defended the independence of his territory, and kept the Spaniards at bay during the whole of his manhood.