 After acquiring the site in 1142 , they began building a new castle to replace the former Kurdish fortification . This work lasted until 1170 , when an earthquake damaged the castle . An Arab source mentions that the quake destroyed the castle 's chapel , which was replaced by the present chapel . In 1163 the Crusaders emerged victorious over Nur ad @-@ Din in the Battle of al @-@ Buqaia near Krak des Chevaliers . 
 After acquiring the site in 1142 , they began building a new castle to replace the former Kurdish fortification . This work lasted until 1170 , when an earthquake damaged the castle . An Arab source <a href='uninflect' title='1'><mark>mentions</mark></a> that the quake destroyed the castle <a href='null_genetive' title='2'><mark>'s</mark></a>chapel , which was replaced by the present chapel . In 1163 the Crusaders emerged victorious over Nur ad @-@ Din in the Battle of al @-@ Buqaia near Krak des Chevaliers . 
After acquiring da site in 1142 , they began building a new castle to replace the former Kurdish fortification . dis wrk lasted until 1170 , when an earthquake damaged the castle . An Arab source mention dat the quake destroyed the castle  chapel , which was replaced by tdapresent chapel . In 1163 the Crusaders emerged victorious over Nur ad @-@ Din in the Battle of al @-@ Buqaia near Krak des Chevaliers .