Kammala jumla mai zuwa: Tsakanin Mayu da Disamba 1916, 13th (Western) Division ya sake gyarawa kuma ya sake ba da kayan aiki a shirye-shiryen tafiya zuwa arewa don kama Baghdad. A watan Yuli, an daukaka Manjo-Janar Maude ya zama kwamandan da aka fadada kuma aka sake masa suna Mesopotamian Expeditionary Force. A matsayinsa, Brigadier Janar Cayley, tsohon kwamandan Brigade na 39, an daukaka shi zuwa kwamandan rundunar. A ranar 12 ga Disamba, 1916, rukunin ya ci gaba daga Sheik Sa'ad a Kut. A cikin
Yaƙin Kut na biyu, sashin ya taimaka wajen fitar da sojojin Ottoman daga garin. Bayan ɗan gajeren lokaci, sashin ya koma arewa, ya ƙetare Kogin Diyala, kuma ya shiga cikin kama Bagadaza a ranar 11 ga Maris, 1917. Bayan kama Bagadaza, Rukunin na 13 (Yamma) ya yi yaƙe-yaƙe da yawa don ƙarfafa ikon Birtaniyya akan Baghdad vilayet. Wannan ya hada da fada a Dellis Abbas (27 zuwa 28 ga Maris 1917), Duqma (29 ga Maris 1917), Nahr Kalis (9 zuwa 15 ga Afrilu 1917), wucewar Adhaim (18 ga Afrilu 1917) da aikin Shatt al 'Adhaim (30 ga Afrilu 1917). Duk da rashin aiki na Birtaniyya don ci gaba, sashin ya kuma yi yaƙi a na biyu da na uku na Jabal Hamrin (16-20 ga Oktoba 1917 da 3-6 Disamba 1917).