Weizsäcker knowing that a planned German invasion of Poland scheduled for August 1939 (later pushed back to 1 September) was likely to cause an Anglo-German war, had adopted his policy of offering to restore independence to Czechoslovakia sans the Sudetenland in exchange for which Britain would end the "guarantee" of Poland and allow Germany to take back the Free City of Danzig, the Polish Corridor and parts of Upper Silesia lost to Poland.