 Rain interrupted the siege , but on 21 March , immediately south of Krak des Chevaliers , Baibar 's forces captured a triangular outwork possibly defended by a timber palisade . On 29 March , the attackers undermined a tower in the southwest corner causing it to collapse whereupon Baibars ' army attacked through the breach . In the outer ward they encountered the peasants who had sought refuge in the castle . Though the outer ward had fallen , with a handful of the garrison killed in the process , the Crusaders retreated to the more formidable inner ward . After a lull of ten days , the besiegers conveyed a letter to the garrison , supposedly from the Grand Master of the Knights Hospitaller in Tripoli , which granted permission for them to surrender . Although the letter was a forgery , the garrison capitulated and the Sultan spared their lives . The new owners of the castle undertook repairs , focused mainly on the outer ward . The Hospitaller chapel was converted to a mosque and two mihrabs were added to the interior . 
 Rain interrupted the siege , but on 21 March , immediately south of Krak des Chevaliers , Baibar <a href='null_genetive' title='1'><mark>'s</mark></a>forces captured a triangular outwork possibly defended by a timber palisade . On 29 March , the attackers undermined a tower in the southwest corner causing it to collapse whereupon Baibars <a href='null_genetive' title='2'><mark>'</mark></a>army attacked through the breach . In the outer ward they encountered the peasants <a href='null_relcl' title='3'><mark>who</mark></a><a href='been_done' title='4'><mark>had</mark></a> sought refuge in the castle . Though the outer ward <a href='been_done' title='5'><mark>had</mark></a> fallen , with a handful of the garrison killed in the process , the Crusaders retreated to the more formidable inner ward . After a lull of ten days , the besiegers conveyed a letter to the garrison , supposedly from the Grand Master of the Knights Hospitaller in Tripoli , which granted permission for them to surrender . Although the letter was a forgery , the garrison capitulated and the Sultan spared their lives . The new owners of the castle undertook repairs , focused mainly on the outer ward . The Hospitaller chapel was converted to a mosque and two mihrabs <a href='uninflect' title='6'><mark>were</mark></a> added to the interior . 
Rain interrupted the siege , but on 21 March , immediately south of Krak des Chevaliers , Baibar  forces captured a triangular outwork possibly defended by a timber palisade . On 29 March , da attackers undermined a tower in the southwest corner causing it to collapse whereupon Baibars  army attacked through the breach . In the outer ward they encountered the peasants done sought refuge in tdacastle . Though the outer ward done fallen , with a handful of thdaarrison killed in the process , the Crusaders retreated to the more formidable inner ward . After a lull of ten dayz , the besiegers conveyed a letter to the garrison , supposedly from thedaand Master of the Knights Hospitaller in Tripoli , which granted permission for them to surrender . Although the letter was a forgery , the darison capitulated and the Sdaan spared their lives . The nedawners of the casda undertook repairs , focused mainly on the outer ward . The Hospdaller chapel was converted to a mosque and 2 mihrabs was added to the interda .