Failure at Stalingrad was due to several factors
1) weather (did for Napoleon too)
2) poor resources (tanks that weren't suitable for the terrain as well as lack of air cover etc)
3) shit tactics - primarily the fact that they should not have been anywhere near there at that point, let alone fighting in the manner in which they were forced to
( Monty Boyce, My cheese game is strong, Tue 14 Dec 2010, 10:20, Reply)