Assertion: battle | /r/CapableOf | fight at kosovo polje
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text: [June 15, Old Style], 1389), battle fought at Kosovo Polje ("Field of the Blackbirds"; now in Kosovo) between the armies of the Serbian prince Lazar and the Turkish forces of the Ottoman sultan Murad I (reigned 1360–89) that left both leaders killed and ended in a Turkish victory, the collapse of Serbia, and the complete encirclement of the crumbling Byzantine Empire by Turkish armies.