As soon as you factor the Russian Winter into the equation, the Eastern Front of WW2 was perhaps the most horrible war area in history. The question is, which of those battles was the fiercest. Stalingrad would probably be it, but there are many alternatives that were quite terrible.
"It is well that war is so terrible, else we should grow too fond of it."
- General Robert E. Lee
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"It takes a big man to admit when he's wrong. I am NOT a big man." -Chevy Chase