1-dii Agoosto 1915, Mackinolty waxaa loo wareejiyay Ciidanka Boqortooyada Australia, si uu u hoggaamiyo koox ka kooban saddex iyo toban farsamoyaqaanno kale oo xoojin u ah ciidanka duulista Australia ee ka shaqeeya ololaha Mesopotamian. Wuxuu ka tagay Melbourne sagaal maalmood ka dib isagoo saaran RMS "Persia", wuxuuna yimid Basra 1dii Sebtember. Kooxda Mackinolty waxay isla markiiba ku biireen No. 30 Squadron Royal Flying Corps (asal ahaan Mesopotamian Half Flight AFC), oo u dhaqaaqay magaalada Kut ka dib markii ay qabsadeen ciidamada Boqortooyada Ingiriiska Dagaalkii Es Sinn. Qaybta waxay ka qayb qaadatay Dagaalkii Ctesiphon bishii Nofeembar, waxayna abaabushay sahay u dirtay ciidankii Ingiriiska iyo Hindiya ee Kut intii lagu jiray go'doominta.
taas oo soconaysay laga soo billaabo December 1915 ilaa iyo April sanadka xiga.