Pedzisa mutsara unotevera: Corbett aiva nemakore 18 pakatanga Hondo Yenyika I; akawana basa muAyrshire Yeomanry akaenda navo kuGallipoli muna October 1915. VaAyrshires vaive pakati pemasoja ekupedzisira kubviswa uye vakaenda kubva ikoko kuenda kuEgypt, vachiumba chikamu chevashandi vemabhiza muhondo yechipiri yeGaza. Akabva aendeswa kuGrenadier Guards; mushure mekudzidziswazve akatumirwa kuWestern Front munaKurume 1918, achijoinha 1st Battalion paMercatel semutevedzeri. Ikoku kwakabvumirana neGermany Spring Offensive (
Operation Michael), uye battalion yacho yakakurumidza kuita chiito. PaBoyelles musi wa30 Kurume 1918, Corbett akaedza kuchera vamwe varwi vakanga vakuvara vakanga vavigwa neartillery, apo "vaive pasi pemoto unorema uye vachinyatsoonekwa nemuvengi" uye vakapihwa Military Cross asi vakakuvara gumbo izvo zvakamusiya aine hurema husingaperi.