You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.

In 1582 the united provinces invited francis, duke of anjou to lead them; but after a failed attempt to take antwerp in 1583, the duke left the netherlands again. after the assassination of william of orange (10 july 1584), both henry iii of france and elizabeth i of england declined the offer of sovereignty. however, the latter agreed to turn the united provinces into a protectorate of england (treaty of nonsuch, 1585), and sent the earl of leicester as governor-general. this was unsuccessful and in 1588 the provinces became a confederacy. the union of utrecht is regarded as the foundation of the republic of the seven united provinces, which was not recognized by the spanish empire until the peace of westphalia in 1648.
Solution: In what year did francis, duke of anjou leave the netherlands?
Why? The generated question is perfect. Because the question is based on second sentence of the input passage and its answer is 1583.

New input: The Toi invasion was the invasion of northern Kyushu by Jurchen pirates in 1019. At the time, Toi meant "barbarian" in the Korean language. The Toi pirates sailed with about 50 ships from direction of Goryeo, then assaulted Tsushima and Iki, starting 27 March 1019. After the Iki Island garrison comprising 147 soldiers was wiped out, the pirates has proceed to Hakata Bay. For a week, using Noko Island in the Hakata Bay as a base, they sacked villages and kidnapped over 1,000 Japanese, mostly women and young girls, for use as slaves. The Dazaifu, the administrative center of Kyushu, then raised an army and successfully drove the pirates away. During the second failed raid to Matsuura 13 April 1019, three enemies were captured by the Japanese army. They were identified as Koreans. They said that they had guarded the borderland but had been captured by the Toi. However, this was unlikely, and the Japanese officers suspected them because there had been Korean pirates attacking Japan coasts during the Silla period. A few months later, the Goryeo delegate Jeong Jaryang reported that Goryeo forces attacked the pirates off Wonsan and rescued about 260 Japanese. The Korean government then repatriated them to Japan where they were thanked by the Dazaifu and given rewards. There remain detailed reports by two captive women, Kura no Iwame and Tajihi no Akomi. These Jurchen pirates lived in what is today Hamgyongdo, North Korea.
Solution:
Who took 1000 Japanese for use as slaves?