Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Victory disease:

"

* The catastrophic decision by Hitler to invade the Soviet Union in 1941 underestimated Soviet military resilience and counted on the success of the tactics used in previous campaigns, such as the Invasion of Poland and the Battle of France. Confident of victory, the Germans did not count on getting caught in a Russian winter or rasputitsa (mud season). As a result, the German offensive in the Soviet Union was halted on December 5, 1941.