This book offers a revisionist interpretation of British foreign policy towards Poland and the role of the Anglo-Polish relationship during the period March-September 1939. It challenges and questions hitherto held views on the British determination to defend Poland and oppose German expansion eastwards. It includes a study of foreign policy, economic policy and military planning. This book is a major contribution to our knowledge of the outbreak of the war because it contains a unique and original study of the role of the Poles in British proposals for an eastern front and the Polish perception of their relationship with Germany. Finally the inconclusive nature of British approaches to the Soviet Union and the Rumanian government are put into the context of the abortive proposal for an eastern front against Germany.