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From 1430 onwards the Ottomans, under Sultan Murad II, began a campaign to recover their lost Balkan territories. By 1439 they had taken Borač, Zvornik and Srebrenica, and by 1440 Serbia had become an Ottoman province. In 1444 Murad heavily defeated a crusading army of Poles, Hungarians, Croatians, Serbs and...
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