1939, paulus was promoted to major general. 1on August 26th, 939, paulus was appointed as the chief of staff of the 10 army commanded by Reich nau. The group army is the main assault force of the German army to carry out the Polish campaign. Paulus gave full play to his advantages of being calm, good at thinking and paying attention to strategy, and cooperated quite tacitly with the energetic, brave and decisive Raisino. Therefore, the 10 Army (renamed the Sixth Army after the capture of Warsaw) played an important role in the wars against Poland, Belgium and France. After the conquest of France, paulus was promoted to lieutenant general. 1940 In September, paulus became the German Deputy Chief of Staff, responsible for the organization and training of Deyang Army. He went to North Africa to meet Rommel and discussed the invasion of Yugoslavia with Hungarian leaders. However, paulus's main task is to guide the formulation of the strategic plan for invading the Soviet Union. Paulus believes that in order to defeat the Soviet Union, Germany must not allow Soviet military forces to retreat to the mainland. It is particularly important to choose strategically to divide and encircle the Soviet Union and seize Moscow. Paulus also stressed the absolute need to ensure logistics supplies and reserve support.