the Russian people vs. the Germans

I found it quite interesting that the German army met resistance from the Russian people as a whole. The people of previous countries that he took control of didn't seem to fight back, probably out of fear. The strength of the Russian people can be seen when they stand up to the Germans by spying for the Red army, as read in In Deadly Combat. Hitler underestimated Russia because of the landscape, weather, and the people. The strength of the Red army was great because they believed what they were fighting for and were willing to fight to the death. It was mentioned in class that it was mostly everyday men in the Red army, not trained fighters, this probably made Hitler and his commanders over confident when they should have been prepared for a strong resistance.