Sichuan anti-Mongol fortresses
... that Möngke Khan was the only khagan to die in an attack on the Sichuan anti-Mongol fortresses?
... that <a href="./Möngke_Khan" id="mw3Q" rel="mw:WikiLink" title="Möngke Khan">Möngke Khan</a> was the only <a href="./Khagan" id="mw3g" rel="mw:WikiLink" title="Khagan">khagan</a> to die in an attack on the <b id="mw3w"><a href="./Sichuan_anti-Mongol_fortresses" id="mw4A" rel="mw:WikiLink" title="Sichuan anti-Mongol fortresses">Sichuan anti-Mongol fortresses</a></b>?