Yakin Saniyy wata dabara ce tsakanin sojojin larabawa musulmi karkashin jagorancin Khalid ibn al-Walid da daular Sasaniya, wadanda abokansu na larabawa kiristoci suka kara masa baya, a lokacin yakin farko na Musulunci.Bayan nasarar da aka samu a Muzayyah da sauran wurare, Khalid bn al-Walid ya kai hari kan Saniyy da nufin hana sojojin Larabawa Sasaniyya da Kirista hadin gwiwa.Dangane da ci gaban musulmi, Bahman, wani kwamandan Sasaniya, ya shirya wata sabuwar runduna wadda ta ƙunshi waɗanda suka tsira daga yaƙe-yaƙe da suka gabata, da dakarun soja, da sabbin ma'aikata.Duk da cewa ba su da gogewa, wannan runduna ta ƙaru daga kabilun Larabawa na Kiristanci, sakamakon hasarar da aka yi a Ayn al-Tamr da mutuwar shugabansu, Aqqa.Sun nemi kwato yankunan da suka bata tare da 'yantar da 'yan uwan ​​da aka kama.Bahman ya raba dabarar sojojinsa, inda ya aika da su ga Husaid da Khanafis, yayin da yake jiran shirye-shiryen dakarun Larabawa na Kiristanci don kai hari tare.Khalid, yana hasashen barazanar hadakar rundunar makiya, ya shirya tsaf don raba dakarunsa da nufin shiga tsakanin makiya, inda ya yi nasarar aiwatar da dabarar rarraba da cin nasara.Ya tura dakarunsa zuwa Ain-ul-Tamr, inda ya tsara su zuwa gawawwaki uku tare da shirya kai hare-hare a lokaci guda kan tarwatsa sojojin makiya.Duk da kalubalen dabaru, sojojin Khalid sun ci nasara a Husaid da Khanafiyya, lamarin da ya tilasta wa sauran abokan gaba ja da baya tare da sake haduwa da Larabawa Kirista a Muzayyah.Bayan haka, Khalid ya aiwatar da wani harin dare a kan Saniyy a mako na biyu na Nuwamba 633 AD, inda ya yi amfani da hari ta uku wanda ya mamaye masu tsaron baya.Yakin ya haifar da gagarumar hasarar sojojin Larabawa na Kirista, ciki har da mutuwar kwamandansu Rabi'a bin Bujair.Mata, yara, da matasa an kubutar da su, aka kama su.Bayan wannan nasara, Khalid ya yi gaggawar matsawa wajen kawar da sauran dakarun da suka rage a Zumail, tare da kawo karshen tasirin Farisa a Iraki da kuma tabbatar da yankin ga musulmi.