By informing Allied forces of German movements between the towns of Caen and Bayeux, he contributed to the success of the D-Day landings of 6 June 1944.
baɪ ɪnfˈɔːɹmɪŋ ˈælaɪd fˈoːɹsᵻz ʌv dʒˈɜːmən mˈuːvmənts bᵻtwˌiːn ðə tˈaʊnz ʌv kˈiːn ænd bˈeɪjuː, hiː kəntɹˈɪbjuːɾᵻd tə ðə səksˈɛs ʌvðə dˈiːdˈeɪ lˈændɪŋz ʌv sˈɪks dʒˈuːn nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi fˈoːɹ.