In 1942, members of the British Parliament characterised the campaign in Greece as a "political and sentimental decision". Eden rejected the criticism and argued that the UK's decision was unanimous and asserted that the Battle of Greece delayed Operation Barbarossa, the Axis invasion of the Soviet Union. This is an argument that historians used to assert that Greek resistance was a turning point in World War II. According to film-maker and friend of Adolf Hitler Leni Riefenstahl, Hitler said that "if the Italians hadn't attacked Greece and needed our help, the war would have taken a different course. We could have anticipated the Russian cold by weeks and conquered Leningrad and Moscow. There would have been no Stalingrad". Despite his reservations, Field Marshall Brooke seems also to have conceded that the Balkan Campaign delayed the offensive against the Soviet Union.