▁assault ▁on ▁the ▁fort ifications ▁of ▁the ▁city , ▁captured ▁Pet ra ▁by ▁sending ▁his ▁troops ▁through ▁a ▁secret ly ▁constructed ▁tunnel ▁and ▁destroy ing ▁the ▁to wers , ▁which ▁induced ▁the ▁Rom ans ▁to ▁capit ulate . ▁Kh os row ▁appropri ated ▁the ▁rich es ▁of ▁T z ibus , ▁who ▁was ▁killed ▁in ▁battle , ▁but ▁treated ▁the ▁Rom ans ▁of ▁the ▁city ▁with ▁consideration . ▁ ▁In ▁ 5 4 8 , ▁Justin ian ▁sent ▁a ▁force ▁under ▁D ag is th ae us — this ▁time ▁al lied ▁with ▁the ▁L azi , ▁who ▁had ▁become ▁dis content ▁with ▁S as an ian ▁h eg em ony — to ▁re take ▁Pet ra . ▁The ▁al lies ▁bes ie ged ▁the ▁city ▁and ▁defeated ▁two ▁S as an ian ▁field ▁arm ies ▁sent ▁to ▁its ▁aid , ▁but ▁subsequent ▁man eu vers ▁by ▁the ▁Iran ian ▁commander ▁Mi hr - M ih roe ▁made ▁the ▁bes ie gers ' ▁positions ▁un ten able . ▁Event ually , ▁D ag is th ae us ▁failed ▁to ▁re take ▁Pet ra ▁in ▁ 5 4 9 ▁and ▁with d rew ▁the ▁same ▁year . ▁In ▁ 5 5 1 , ▁a ▁Roman – L azi ▁army ▁under ▁B ess as ▁began ▁a ▁second ▁sie ge . ▁After ▁more ▁than ▁a ▁year , ▁the ▁city ▁fell ▁and ▁B ess as ▁raz ed ▁the ▁city ▁for tr ess ▁to ▁the ▁ground ▁to ▁prevent ▁it ▁again ▁becoming ▁a ▁S as an ian ▁target .