The faith survived only around the Jesuit fort in Ambon; even there, there was a shortage of priests due to dangerous conditions, and many local people did not have knowledge of Christian creeds, and were easily apostatised to Islam or traditional beliefs. The Portuguese by now largely impotent, the Dutch, allied with the Muslim locals against their mutual Portuguese enemy, seized the fort of Ambon in 1605. The Dutch expelled the Jesuits and Portuguese, adopting the Catholic churches for Protestant worship, which was supported through the establishment of numerous Protestant schools, where the teachers also led Sunday worship. Boundaries between Muslim and Christians were well-established on Ambon, but in Seram and Buru, proselytisation took place converting 'pagans' to Christianity, the policy of the VOC being to contain the spread of Islam without converting existing Muslims. Idols were destroyed by the Dutch teachers as new Christians were prohibited from continuing to follow their traditional religion. Papua, unlike the rest of Indonesia, has had no historic contact with Muslim preachers, and had its first Christian missionary contact in 1855. With little competition, the mission was relatively successful. Missionaries Carl Ottow and Johann Geisler, under the initiative of Ottho Gerhard Heldring, entered Papua at Mansinam island, near Manokwari on 5 February 1855, and are said to have knelt on the beach and prayed, claiming Papua for Christ. Since 2001, the fifth of February has been a Papuan public holiday, recognising this first landing. Ottow and Geisler studied the Numfor language, and were subsequently granted a monthly stipend by the Dutch government. The missionaries proposed a scheme to start a tobacco plantation using Christian Javanese to train the Papuans, and were given 5,000 guilders by the Dutch and two Christian Javanese tobacco farmers. The Dutch administrators perceived the missionaries activities as a cut-price means of colonisation, while the missionaries themselves made profits from trading Papuan goods. The Utrecht Mission Society (UZV) joined the mission from 1863; they were prohibited from trade, and instead established a trading committee. The UZV established a Christian-based education system as well as regular church services. Initially the Papuans' attendance was encouraged using bribes of betel nut and tobacco, but subsequently this was stopped. In addition, slaves were bought to be raised as step children and then freed. By 1880, only 20 Papuans had been baptised, including many freed slaves.