The invasion was a ghastly failure for the Russians, a setback which was followed by considerable German advances in the following year, including the capture of the Polish city of Warsaw . However, the crisis caused in the German High Command by the unexpected Russian advance forced the sending of 2 corps and a cavalry division from the Western Front as part of the new 9th Army in order to support the attack on the Russians. These additional forces did not arrive in time for the twin battles, as Ludendorff predicted and, had they entered France as originally planned could have been tremendously helpful to the precarious situation in the West. In the head of French Intelligence Colonel Dupont's words, "their debacle was one of the elements of our victory."   
Hitler tried to dissuade the British and the French from interfering in the upcoming conflict and on 26 August 1939 proposed to make Wehrmacht forces available to Britain in the future.  At midnight on 29 August, German Foreign Minister Joachim von Ribbentrop handed British Ambassador Neville Henderson the list of terms that would allegedly ensure peace in regards to Poland.  Under the terms, Poland was to hand over Danzig ( Gdańsk ) to Germany, and there was to be a plebiscite ( referendum ) in the Polish Corridor within the year based on residency from 1919 (not after).  When the Polish Ambassador Lipski went to see Ribbentrop on 30 August and said that he did not have the power to sign anything of the sort, Ribbentrop dismissed him.  The Germans announced that Poland had rejected German offer and negotiations with Poland were finished.  On 31 August, German units posing as Polish troops staged the Gleiwitz incident near the border city of Gleiwitz .  The following morning Hitler ordered hostilities against Poland to start at 04:45 on 1 September.