On what date did the Soviets attack the 3rd Panzer Army with 700 tanks ?
There was no immediate German withdrawal , but the German command decided on February 21 to withdraw the headquarters of the XXXIX Panzer Corps as well as the " Führer - Grenadier " , " Führer - Begleit " , " Holstein " , and 10th SS Panzer Divisions westward behind Army Group Center , practically ensuring that eastern Pomerania would fall to the Soviets .