Answer:
2 an extensive loss of German soldiers
3 exhausted German supplies
4 the end of the German advance
Step-by-step explanation:
Russia is infamous for harsh living conditions. I don't think Germans were well prepared for this as they died mostly from cold and lack of food. The allied forces killed so many of the weak soldiers making the rest of the troops to flee back. This stopped germany from advancing on Russia and turned the tide in favor of allies.