Dutch women were kept as sexual slaves by the Chinese after the Dutch were expelled from Taiwan in 1662. During the 1662 Siege of Fort Zeelandia in which Chinese Ming loyalist forces commanded by Koxinga besieged and defeated the Dutch East India Company and conquered Taiwan, the Chinese took Dutch women and children prisoner. The Dutch missionary Antonius Hambroek, two of his daughters, and his wife were among the Dutch prisoners of war who were being held captive by Koxinga. Koxinga sent Hambroek to Fort Zeelandia demanding that he persuade them to surrender or else Hambroek would be killed when he returned. Hambroek returned to the Fort, where two of his other daughters were being held prisoner. He urged the commander of the Fort not to surrender, and returned to Koxinga's camp. He was then executed by decapitation, and in addition to this, a rumor was spread among the Chinese that the Dutch were encouraging the native Taiwanese aboriginals to kill Chinese, so Koxinga ordered the mass execution of Dutch male prisoners in retaliation, in addition to a few women and children who were also being held prisoner.