Because they were being smothered in the terrible cold that they were ill-prepared for. They wanted to withdraw them so as not to lose too much, an attempted action that failed, causing Hitler to suffer irreplaceable losses in both troops and equipment in their fighting the red army.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.