During the summer and autumn of 1636, a Mindanao chief named Tagal harries the coasts of Cuyo and Calamianes. Returning homeward laden with booty and captives, these pirates are attacked (December 21) by a hastily-gathered Spanish force of ships and men, and in this battle Tagal and many of his followers are slain, and most of their plunder recovered. This victory is a great gain to the Spaniards in maintaining their stand against the hostile Moros, and many of the latter are rendered submissive for the time being. An account of these events is given in a letter unsigned and undated, but evidently written early in 1637, and probably by the Jesuit Pedro Gutierrez.
By order of the royal Council a compilation is made (February, 1637?) of all information in the government records pertaining to the office of auditor of accounts at Manila. The writer (some clerk in the government employ) gives a brief historical sketch of this office, its relations with the royal officials, the advantages and disadvantages connected with it, and the proceedings of the council regarding this office, up to 1637.
The Moro raids of 1636 arouse the Spaniards to the urgent necessity of subduing those fierce and treacherous pirates; and Corcuera organizes an expedition to Mindanao, led by himself, for their punishment. Several accounts of this campaign (which had far-reaching consequences) are presented--largely from Jesuit sources, since members of that order accompany the governor, and it is their missions which are most endangered by the hostility of the Moros in Mindanao.
One of these is a letter (June 2, 1637) from the celebrated martyr in the Japanese missions, Marcelo Francisco Mastrilli, who went to Mindanao with Corcuera. He relates with much detail the events of the expedition, which the devil strives from the start to hinder. The Spaniards capture the Moro forts at the mouth of the Rio Grande, killing several of Corralat's best officers, and seizing many vessels and military supplies; then they destroy many villages belonging to him. On March 18, the Spaniards storm a fortified height back of the port where they first entered. Corralat is driven from it, and flees to a little village in his territory; and in the conflict his wife and many of his followers are slain. Some Recollect fathers, held captive by the Moros, also perish--one of them slain by them, in anger at their defeat. Corralat's treasure is seized, and divided among the soldiers; and much booty obtained by the Moros in plundering the churches in their raids is recovered. After destroying all that can be found, Corcuera returns to Zamboanga, leaving troops behind to subdue another Moro ruler, named Moncay. The wounded Spaniards--many of whom were injured by poisoned arrows--are cared for at Zamboanga, so successfully that only two men out of eighty die, and these "because they would not let themselves be cured." Mastrilli ascribes this success not so much to the antidotes that had been furnished from Manila as to the virtues of a relic that he had, of St. Francis Xavier, and to the patients' faith therein. In due time, the detachment sent against Moncay return, bringing that chief's brother as envoy to offer his submission, and a promise to aid the Spaniards against Corralat, and to receive among his people Jesuit missionaries. Corcuera returns to Manila, after sending an expedition to reduce the villages on the western coast of the island, and arranging for opening a mission on the island of Basilan and securing for its people (who desire to maintain friendship with the Spaniards) the protection of the Spanish fort at Zamboanga. Other Moros along the southern coast offer to become the vassals of Spain, and the Joloans hasten to secure peace with the conqueror. All this opens a broad field for gospel work, and Mastrilli urges that Jesuit missionaries hasten to till it.