From the first, Basco did what he could to restrain the incursions of the Moro pirates; but he had many difficulties to encounter. He repaired the forts in Mindanao and the Visayan Islands; he built small vessels, and stationed them in Cebú, Iloilo, Zamboanga, and Calamianes, from which points they could more promptly set out to punish the Moros; and he sent an expedition to Mamburao, in Mindoro, which drove out the pirates who, as we have already seen, had established themselves there. These raids being thus checked for the time, trade began to improve; "and from Sámar alone, whose traffic with Manila had been paralyzed for more than ten years, forty-three caracoas went to the capital in 1779." The sultan of Joló humbly asked Basco for peace, and returned to the Spaniards a small vessel captured near Antique by one of his dattos, "an unusual proceeding among the pirates." The natives of Bulacan voluntarily offered (December, 1781) to pay for the cost of two vessels to sail against the pirates, and imposed on themselves for this purpose a tax of one-half a real a year on each tribute; this proving insufficient, they increased it, in the summer of 1784, with a ganta of unhulled rice per tribute. This example was immediately followed by the natives of Pampanga. In 1782, the Visayas were invaded by a Mindanao host; but on several occasions the Spaniards succeeded in defeating the pirates and sinking many of their boats. Basco conquered the Batanes Islands, north of Luzon, [29] and this enterprise for a time diverted his military forces from the Moros, who consequently increased their depredations on the Visayan natives and carried away many captives from Calamianes, Panay, and Negros. By royal orders of July 17 and 26, 1784, the post of quartermaster-general of the islands was created, in accordance with a request by Basco; and that of deputy-intendant of the exchequer was united with it, independent of the superior government of the islands. It was placed in charge of one of the auditors, Ciriaco González Carvajal, also at Basco's recommendation; and from this time the royal officials were styled "ministers of the royal exchequer." Carvajal aided Basco greatly in establishing the monopoly of tobacco, and it was he who drew up the instructions to officials on this subject. In 1785, a dispute arose between them over the establishment of the tobacco monopoly in Camarines and Albay, each regarding this undertaking as the prerogative of his own office. Carvajal proposed that provincial intendancies should be created in Ilocos, Camarines, Cebú, and Iloilo; this was done, and approved by royal orders of November 24, 1786; but a year later the Spanish government suppressed Carvajal's office, and these provincial intendancies as well.