the siege of Mongol invaders
... that the Nizari (Assassin) garrison of Gerdkuh resisted the siege of Mongol invaders for 13 more years after the surrender of their leaders?
... that the <a href="./Nizari_Ismaili_state" id="mwCOM" rel="mw:WikiLink" title="Nizari Ismaili state">Nizari</a> (Assassin) garrison of <a href="./Gerdkuh" id="mwCOQ" rel="mw:WikiLink" title="Gerdkuh">Gerdkuh</a> resisted <b id="mwCOU"><a href="./Mongol_campaign_against_the_Nizaris" id="mwCOY" rel="mw:WikiLink" title="Mongol campaign against the Nizaris">the siege of Mongol invaders</a></b> for 13 more years after the surrender of their leaders?