▁work ▁was ▁carried ▁out ▁on ▁the ▁cit adel . ▁In ▁ 1 0 9 6 , ▁Rad wan ▁bes ie ged ▁the ▁cit adel ▁but ▁failed ▁to ▁capture ▁it . ▁ ▁During ▁the ▁rule ▁of ▁the ▁Bur id ▁dynast y ▁( 1 1 0 4 – 1 1 5 4 ), ▁work ▁was ▁carried ▁out ▁on ▁the ▁cit adel ▁in ▁response ▁to ▁multiple ▁attacks ▁on ▁Dam asc us ▁by ▁Cr us ader ▁and ▁Muslim ▁arm ies . ▁In ▁ 1 1 2 6 , ▁a ▁Cr us ader ▁army ▁approached ▁Dam asc us , ▁but ▁their ▁advance ▁was ▁stopped ▁ ▁from ▁the ▁city . ▁A ▁second ▁attempt ▁by ▁Cr us aders ▁in ▁ 1 1 2 9 ▁advanced ▁to ▁within ▁ ▁of ▁the ▁city ▁before ▁they ▁had ▁to ▁retre at . ▁Z eng i , ▁the ▁at ab eg ▁of ▁Ale ppo ▁and ▁Mos ul , ▁attacked ▁Dam asc us ▁in ▁ 1 1 3 5 ▁and ▁again ▁in ▁ 1 1 4 0 . ▁Z eng i ' s ▁second ▁attack ▁was ▁th wart ed ▁because ▁Dam asc us ▁for ged ▁a ▁coal ition ▁with ▁the ▁Cr us ader ▁states ▁to ▁the ▁south , ▁arg uing ▁that ▁if ▁Dam asc us ▁were ▁conquer ed , ▁these ▁states ▁would ▁fall ▁as ▁well . ▁Cr us ader ▁arm ies ▁attacked ▁Dam asc us ▁a ▁third ▁time ▁in ▁ 1 1 4 8 ▁during ▁the ▁Second ▁Cr us ade . ▁This ▁sie ge ▁of ▁Dam asc us ▁ended ▁within ▁a ▁week ▁when ▁an ▁army ▁led