Task: Question Generation
Input (English): Passage: 1564: The city of Ryazan posad was burned.:47 1571: Russo-Crimean War 1572: Battle of Molodi 1591: Raid reaches Moscow. :116 1591: Artillery stops a raid at Kolomenskoy on the Bank Line. :52 1592: Suburbs of Moscow burned.  Russian troops were away fighting Sweden.:17 1598: Crimeans stopped by Bank Line, withdraw and sue for peace.:46 1614: Nogai raids within sight of Moscow. During the Time of Troubles so many captives were taken that the price of a slave at Kaffa dropped to fifteen or twenty gold pieces.:66 1618: Nogais release 15,000 captives in peace treaty with Moscow. 1632: Force from Livny ambushed by Tatars and Janissaries. 300 killed and the rest enslaved.:67 1632: 20,000 Tatars raid the south, as troops were shifted north for the Smolensk War.:76 1633: 30,000 Tatars cross Abatis and Bank lines. Thousands were captured from Oka region.:76 This was the last deep raid into Muscovy. :26 1635: Many small war parties invaded Russia south of Ryazan.:79 1637,41-43: Several raids were led by Nogais and Crimean nobles without permission of Khan.:90 1643: 600 Tatars and 200 Zaporozhian Cossacks raid Kozlov. 19 were killed, and 262 were captured.:23 1644: 20,000 The Tatars raid southern Muscovy, 10,000 captives.:91 1645: A raid captures 6,000 captives. It is claimed that the Turks encouraged these raids to obtain galley slaves for a war with Venice.:91.
Output (English): How many captives were taken when the Tartars raided southern Muscovy?