Tuhia he haere tonu mō tēnei wāhanga - I muri i te Pakanga o Nahavand
, I whakarewahia e Omar tetahi whakaekenga nui o te Emepaea o Sassanid Persian. Ko te whakaekenga he raupapa o nga whakaeke maha i whakaritea kia wehe, kia whakangaro i o raatau whaainga. I whakarewahia e Omar te whakaekenga ma te whakaeke i te ngakau o Persia, me te whai ki te wehe i Azerbaijan me te rawhiti o Persia. I whai tonu tenei i nga whakaeke i te wa kotahi ki Azerbaijan me Fars. I muri mai, i riro a Sistan me Kirman, na reira ka wehe i te kaha o Pahia, te Khurasan. I whakarewahia te haerenga whakamutunga ki Khurasan, i reira, i muri i te Pakanga o te Awa o Oxus, ka mutu te rangatiratanga o Persia, ka rere a Yazdegerd III ki Central Asia.