Yes you are correct, this however was in the beginning of the conflict as radios were equiped later on. The Germans faced the 15000 absolete Russian tanks which had the same problem.

Surely the Germans would have had a harder time with the 10,000 T-34's rather then 15,000 pee shooters they actully faced?

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The war against Russia will be such that it cannot be conducted in a knightly fashion. This struggle is one of ideologies and racial differences and will have to be conducted with unprecedented, unmerciful and unrelenting harshness. -Adolf Hitler