▁and ▁charged ▁against ▁the ▁Um ay y ad ▁center . ▁This ▁resulted ▁in ▁heavy ▁cas ual ties ▁on ▁both ▁sides ▁and ▁U bay d ▁Al lah ▁and ▁several ▁of ▁his ▁lie uten ants ▁were ▁s lain . ▁The ▁Um ay y ad ▁commander ▁Um ay r ▁ibn ▁al - Hub ab ▁and ▁his ▁Sul ay mi ▁tribes men ▁desert ed ▁while ▁the ▁pro - Al ids ▁purs ued ▁the ▁remaining ▁Um ay y ad ▁troops , ▁scores ▁of ▁whom ▁d rown ed ▁in ▁the ▁Kh az ir ▁River . ▁ ▁Kh az ir ▁was ▁a ▁major ▁set back ▁for ▁the ▁Um ay y ads , ▁who ▁did ▁not ▁launch ▁another ▁invasion ▁of ▁Ira q ▁until ▁ 6 9 1 . ▁However , ▁M uk ht ar ' s ▁victory ▁was ▁short - l ived ▁as ▁he ▁was ▁killed ▁a ▁year ▁later ▁when ▁the ▁Z ub ay rid s ▁took ▁over ▁K uf a . ▁Meanwhile , ▁the ▁blood ▁fe ud ▁between ▁the ▁Q ays i ▁and ▁Yam ani ▁trib al ▁elements ▁of ▁the ▁Um ay y ad ▁C ali ph ate ▁intens ified ▁due ▁to ▁Um ay r ' s ▁mid - b attle ▁defe ction ▁and ▁subsequent ▁spe ar head ing ▁of ▁attacks ▁against ▁the ▁tribes ▁of ▁Tag h lib ▁and ▁Kal b . ▁In ▁these ▁later ▁batt les , ▁the ▁Kal b ▁were ▁led ▁by ▁Hum ay d ▁ibn ▁Hur ay th ▁al - K al bi , ▁an ▁Um ay y ad ▁commander ▁who ▁surv ived ▁Kh az ir .