▁their ▁trib al ▁al lies ▁rout ed ▁the ▁pro - Z ub ay rid ▁Q ays i ▁tribes ▁at ▁the ▁Battle ▁of ▁Mar j ▁Rah it . ▁The ▁Um ay y ad ▁victory ▁brought ▁all ▁of ▁Sy ria ▁under ▁Mar wan ' s ▁authority , ▁but ▁also ▁led ▁to ▁the ▁long - running ▁fe ud ▁between ▁Q ays ▁and ▁Y aman . ▁Later , ▁Mar wan ▁dispatch ed ▁an ▁army ▁led ▁by ▁U bay d ▁Al lah ▁to ▁wrest ▁back ▁Ira q . ▁Control ▁of ▁that ▁region ▁was ▁split ▁by ▁a ▁number ▁of ▁anti - U may y ad ▁fa ctions , ▁including ▁the ▁part is ans ▁of ▁M uk ht ar ▁al - Th a q af i , ▁other ▁pro - Al ids ▁( supp or ters ▁of ▁C ali ph ▁Ali ▁and ▁his ▁family ) ▁and ▁I bn ▁al - Z ub ay r . ▁Mar wan ▁promised ▁U bay d ▁Al lah ▁the ▁governor ship ▁of ▁all ▁the ▁territ ories ▁that ▁he ▁conquer ed . ▁In ▁early ▁January ▁ 6 8 5 , ▁U bay d ▁Al lah ▁was ▁mobil izing ▁his ▁troops ▁at ▁the ▁Eu phr ates ▁River ▁town ▁of ▁J is r ▁Man bij . ▁Ar ound ▁that ▁time , ▁his ▁second - in - command , ▁Hus ay n ▁ibn ▁Num ay r ▁al - S ak uni , ▁destroyed ▁the ▁Pen it ents , ▁a ▁pro - Al id ▁band ▁led ▁by ▁Sul ay man ▁ibn ▁Sur ad , ▁at ▁the ▁Battle ▁of ▁A yn