The big rivers form a defence line by themselves but even these Hitler managed to lose in Russia because the troops were not allowed to retreat in good order so the Red Army troops simply followed the Germans and often even bypassed them during the trip over the rivers. And once the Soviets had created several crossings the defensive circle was broken and retreat continued and the bunkers etc already done had to be abandonedalmost without any use. Iīm not surprised several generals being rather tired of Hitlerīs logic even if it worked in 1941-42 winter.
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