Koxinga, unable to communicate with the mainland of the Empire, turned his attention to the conquest of Formosa Island, at the time in the possession of the Dutch. According to Dutch accounts the European settlers numbered about 600, with a garrison of 2,200. The Dutch artillery, stores, and merchandise were valued at P8,000,000, and the Chinese, who attacked them under Koxinga, were about 100,000 strong. The settlement surrendered to the invaders' superior numbers, and Koxinga established himself as King of the Island. Koxinga had become acquainted with an Italian Dominican missionary named Vittorio Riccio, whom he created a Mandarin, and sent him as Ambassador to the Governor of the Philippines. Riccio therefore arrived in Manila in 1662, the bearer of Koxinga's despatches calling upon the Governor to pay tribute, under threat of the Colony being attacked by Koxinga if his demand were refused. The position of Riccio as a European friar and Ambassador of a Mongol adventurer was as awkward as it was novel. He was received with great honour in Manila, where he disembarked, and rode to the Government House in the full uniform of a Chinese envoy, through lines of troops drawn up to salute him as he passed. At the same time, letters from Formosa had also been received by the Chinese in Manila, and the Government at once accused them of conniving at rebellion. All available forces were concentrated in the capital; and to increase the garrison the Governor published a decree, dated May 6, 1662, ordering the demolition of the forts of Zamboanga, Yligan (Mindanao Is.), Calamianes and Ternale [35] (Moluccas). The only provincial fort preserved was that of Surigao (then called Caraga), consequently in the south the Mahometans became complete masters on land and at sea for half a year. The troops in Manila numbered 100 cavalry and 8,000 infantry. Fortifications were raised, and redoubts were constructed in which to secrete the Treasury funds. When all the armament was in readiness, the Spaniards incited the Chinese to rebel, in order to afford a pretext for their massacre.