What number of assaults were to come together at Warsaw during the invasion of Poland ?
Operation A-Bewegung 1939 - German preparation for the invasion of Poland ; part of Fall Weiss Operation Dirschau 1939 - German operation to safeguard the rail bridge at Tczew , Poland during the invasion Operation Himmler 1939 - German staged attacks in Poland to justify invasion ; part of Fall Weiss Operation Nordwest 1939 - German study for a potential invasion of Britain ; parts of Operation Nordwest were integrated into Operation Seelöwe Operation Ost 1939 - German operation in Southern Poland near the border with Czechoslovakia Plan Z 1939 - German plan to expand the Kriegsmarine to match the strength of the British Royal Navy Planstudie 39 1939 - German air force research Fall Weiss 1939 - German invasion of Poland Fall Rot 1939 - German bombing of Wieluń , Poland ; part of Fall Weiss Operation Sonderaktion Krakau 1939 - German operation to murder members of the intelligentsia at universities in Kraków , Poland Operation Tannenberg 1939 - German plan to exterminate Polish intelligentsia Operation Wasserkante 1939 - German aerial bombing of Warsaw , Poland Operation Blitzableiter 1939–1945 - German bacteriological weapons research