In 1462, Mehmet II (at the time, the Ottoman sultan), invaded Wallachia. When he arrived at the capital city of Târgoviște, he found it deserted.
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The rotting remains of Ottoman prisoners of war, each impaled on a spike, were the only soldiers there to greet him.
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Mehmet didn't retreat right then and there, but he certainly didn't gain any headway, Curta noted.