Rubuta ci gaba don wannan sakin layi - Ubayd Allah ya yi yaƙi da Marwan da ƙabilan ƙabilarsa a kan ƙabilan Qaysi wanda al-Dahhak ibn Qays al-Fihri, gwamnan Damascus ya jagoranci, a yakin Marj Rahit
a watan Agusta na shekara ta 684. An kori Qays kuma an kashe al-Dahhak. An sanya Ubayd Allah a matsayin kwamandan sojojin Marwan wanda, a lokacin Marj Rahit, ya kunshi mutane 6,000 daga wasu kabilu masu aminci. A cewar Kennedy, Ubayd Allah "a bayyane yake da niyyar sake gina sojojin Siriya waɗanda suka yi wa Mu'awiya da Yazid I hidima sosai". Bayan Marj Rahit, Ubayd Allah ya kula da kamfen din da aka yi wa 'yan tawayen Qaysi na Marwan da dansa kuma magaji Abd al-Malik (r. 685<unk>705) a cikin Jazira. Koyaya, sojojin Marwan ba su da yawa don tabbatar da mulkin Umayyad a duk faɗin Khalifanci. Don haka, Ubayd Allah ya fadada daukar ma'aikata don hada da kabilun Qaysi daban-daban. Ya sanya Husayn ibn Numayr al-Sakuni na Kindah a matsayin mataimakinsa, da Shurahbil ibn Dhi'l-Kila' na Himyar, Adham ibn Muhriz na Bahila, al-Rabi'a ibn Mukhariq na Banu Ghani da Jabala ibn Abd Allah na Khath'am a matsayin mataimakan kwamandoji. Ban da Husayn ibn Numayr, duk kwamandojin sun kasance Qaysi ko kuma sun goyi bayan al-Dahhak a kan Marwan.