Is there such a subject? The study of Allied diplomacy has been slow to establish itself, partly because the bulk of the American and British records have only recently become available, but mainly because of the debate about the origins of the Cold War – the contemporary equivalent of the war-guilt question. Because of the paucity of Soviet material it has in practice turned into an argument about American policy and has not, of course, been confined to the wartime period. The search for origins, turning-points and causes employs the advantage of hindsight in deciding what is relevant. It, therefore, tends to overlook the side issues, dead ends and the short-term nature of much wartime diplomacy. Nobody would deny the importance of the origins of the Cold War or of wartime American-Soviet relations. Yet it is misleading to see Allied diplomacy solely in terms of this one theme. There is room for an attempt to examine some other wartime issues and to indicate topics worthy of further exploration. In the rest of this article, therefore, the Cold War will as far as possible be ignored.