The rasputitsa was not an unusual phenomenon .
The Wehrmacht did not prepare for this contingency as the German high command had expected the German army to be in Moscow and beyond at this time , with the campaign over before the end of summer .
The rasputitsa was not an unusual phenomenon , but the Wehrmacht did not prepare for this contingency as the German high command had expected the German army to be in Moscow and beyond at this time , with the campaign over before the end of summer .