A watan Disamba 636, Umar ya umurci Utbah bn Ghazwan ya nufi kudu don kamo al-Ubulla (wanda aka sani da "tashar ruwa na Apologos" a cikin Periplus na Tekun Erythraean) da Basra, don yanke dangantaka tsakanin sojojin Farisa a can da Ctesiphon.Utbah bn Ghazwan ya isa a watan Afrilu 637, kuma ya kwace yankin.Farisawa sun janye zuwa yankin Maysan, wanda kuma daga baya musulmi suka kwace.Bayan ficewa daga Ctesiphon, sojojin Farisa sun taru a Jalula arewa maso gabashin Ctesiphon, wurin da ke da mahimmancin dabaru daga inda hanyoyin da suka kai Iraki , Khurasan da Azarbaijan .Halifa ya yanke shawarar fara tunkarar Jalula;shirinsa na farko shi ne ya share fagen daga arewa kafin daukar wani mataki mai tsauri kan Tikrit da Mosul.Wani lokaci a watan Afrilu 637, Hashim ya yi tafiya a kan shugaban dakaru 12,000 daga Ctesiphon, kuma bayan ya ci Farisawa a yakin Jalula, ya kewaye Jalula tsawon watanni bakwai, har sai da ya mika wuya bisa ka'idojin Jizya.