Why the 33rd army of the general Efremov called devoted and who betrayed it

In Soviet period the Rzhev fight it was completely suppressed by historians. But separate events of this battle became sometimes available to general public. Among their tragedy of the 33rd armies of the general Efremov, surrounded near Vyazma and completely lost. Certainly, it was not presented as the tragedy, similar in Soviet period it was not allowed in stories about similar events. In all descriptions, in particular, in "Memoirs and reflections" Zhukov G. K. were told only about how heroically the army fought in an environment and, alas, suffered heavy losses, even the commander of army was killed in action. Still in...