Mezue ahịrịokwu na-esonụ: N'ihi ntiwapụ nke agha na Japan, Allen laghachiri Australia na March 1942, na August ọ na-elekọta nke arụmọrụ megide
Ndị Japan na-aga n'ihu n'okporo ụzọ Kokoda. N'agbanyeghi na o nwere ihe ịga nke ọma, Allen n'agbanyeghi ihe ọtụtụ ndị na-ewere dị ka nkatọ na-ezighi ezi site n'aka onye isi ndị Allied na South West Pacific Area, US General Douglas MacArthur na onye isi ndị agha ala Allied, Australian General Sir Thomas Blamey, maka ịgagharị nwayọ nwayọ na ịchụ ndị Japan gafee Owen Stanley Ranges. E wepụrụ ya n'ọchịchị ya na 29 Ọktoba 1942. N'ọnwa Ọktoba afọ 1944, Blamey tụrụ aro ka Allen bụrụ Knight Commander nke Order nke British Empire, ọ bụ ezie na a họpụtaghị Allen.