Mezue nkebi ahịrịokwu a: N'afọ ndị mbụ nke nkwekọrịta Briten na Amerịka, ọ na-abụkarị ndị Briten na-eme ihe masịrị ha. Na Nzukọ London n'April 1942, ọ dị ka Brooke na Churchill duhiere General George Marshall, Onye isi ndị agha US, banyere ebumnuche ndị Britain maka ịbata ngwa ngwa na France. N'ọgbakọ nke Casablanca na Jenụwarị 1943, e kpebiri na ndị Allies kwesịrị
Ọchịagha Dwight D. Eisenhower, mere mkpebi nke mere ka e gbuo oge maka mwakpo a chọrọ ịwakpo Ebe Ọdịda Anyanwụ Europe ruo n'afọ 1944. Nkwekọrịta Casablanca bụ n'ezie nkwekọrịta, nke enyi ochie Brooke bụ Field Marshal Sir John Dill, Onye isi nke British Joint Staff Mission na Washington DC. "Eji m [Dill] ụgwọ ekele na-enweghị nsọtụ maka enyemaka ya n'oge ahụ nakwa n'ọtụtụ oge ndị ọzọ yiri ya", ka Brooke dere mgbe agha ahụ gasịrị.