The ceremony of investiture took place in the Government House at Malacanan near Manila on September 24, 1886, when Datto Harun took the oath of allegiance to the King of Spain as his sovereign lord, and received from the Gov.-General, Emilio Terrero, the title of His Excellency _Paduca Majasari Maulana Amiril Mauminin Sultan Muhamad Harun Narrasid_, with the rank of a Spanish lieut.-general. The Gov.-General was attended by his Secretary, the Official Interpreter, and several high officers. In the suite of the Sultan-elect were his Secretary, _Tuan Hadji Omar_, a priest, _Pandita Tuan Sik Mustafa_, and several _dattos_. For the occasion, the Sultan-elect was dressed in European costume, and wore a Turkish fez with a heavy tassel of black silk. His Secretary and Chaplain appeared in long black tunics, white trousers, light shoes, and turbans. Two of the remainder of his suite adopted the European fashion, but the others wore rich typical Moorish vestments. The Sultan returned to his country, and in the course of three months the Nationalist Party chiefs openly took up arms against the King of Spain's nominee, the movement spreading to the adjacent islands of Siassi and Bongao, which form part of the Sultanate. [63] The Mahometans on the Great Mindanao River, from Cottabato [64] upwards, openly defied Spanish authority; and in the spring of 1886 the Government were under the necessity of organizing an expedition against them. The Spaniards had ordered that native craft should carry the Spanish flag, otherwise they would be treated as pirates or rebels. In March, 1887, the cacique of the Simonor ranche (Bongao Is.), named Pandan, refused any longer to hoist the christian ensign, and he was pursued and taken prisoner. He was conveyed on the gunboat _Panay_ to Sulu, and on being asked by the Governor why he had ceased to use the Spanish flag, he haughtily replied that "he would only answer such a question to the Captain-General," and refused to give any further explanation. Within a month after his arrest the garrison of Sulu (Jolo) was strengthened by 377 men, in expectation of an immediate general rising, which indeed took place. The Spanish forces were led by Majors Mattos and Villa Abrille, under the command of Brig.-General Serina. They were stoutly opposed by a cruel and despotic chief, named Utto, who advanced at the head of his subjects and slaves. With the co-operation of the gunboats up the river, the Mahometans were repulsed with great loss. Scores of expeditions had been led against the Mindanao natives, and their temporary submission had usually been obtained by the Spaniards--on whose retirement, however, the natives always reverted to their old customs, and took their revenge on the settlers. Moreover, the petty jealousies existing between the highest officers in the south rendered every peaceful effort fruitless.