Mezue ahịrịokwu na-esonụ: Corbett dị afọ 18 mgbe Agha Ụwa Mbụ tiwapụrụ; o nwetara ọrụ na Ayrshire Yeomanry ma soro ha gaa Gallipoli n'October 1915. Ndị Ayrshires so n'otu ndị agha ikpeazụ a kpọpụrụ ma si ebe ahụ gaa Ijipt, bụrụ akụkụ nke ndị agha ịnyịnya na Agha nke Abụọ nke Gaza. Mgbe ahụ, a kpọfere ya na Grenadier Guards; mgbe a zụchara ya ọzọ, e zigara ya na Western Front na Machị 1918, sonye na 1st Battalion na Mercatel dị ka onye lieutenant. Nke a dabara na German Spring Offensive (
Operation Michael), battalion ahụ nọkwa n'ọrụ. Na Boyelles na 30 Machị 1918, Corbett gbalịrị igwu ụfọdụ ndị agha merụrụ ahụ nke ndị egbe agha liri, ebe "n'okpuru ọkụ siri ike na n'ihu onye iro" ma nye ya obe ndị agha mana ọ merụrụ ahụ ụkwụ nke mere ka ọ nwee nkwarụ na-adịgide adịgide.