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In page History of Belarus:

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From 1569, the Polish–Lithuanian Commonwealth suffered a series of Tatar raids, the goal of which was to loot, pillage and capture slaves into jasyr. The borderland area to the south-east was in a state of semi-permanent warfare until the 18th century. Some researchers estimate that altogether more than 3 million people, predominantly Ukrainians but also Russians, Belarusians and Poles, were captured and enslaved during the time of the Crimean Khanate.[citation needed]