What victories lent optimism to German troops in early 1942?

In early 1942, German troops experienced significant victories that bolstered their optimism, particularly in the Soviet Union during Operation Barbarossa. The capture of key cities like Kyiv and the encirclement of Soviet forces at various fronts showcased the effectiveness of their Blitzkrieg tactics. Additionally, victories in North Africa, such as the capture of Tobruk in June, further strengthened their morale and confidence in achieving quick, decisive wins. These successes contributed to a belief that the war could be concluded swiftly in favor of Germany.