What stopped napoleon from conquering russia and had killed a majority of his army

 The long walk through the cold mountains

Tsar refused to meet Napoleon and his troops in battle. Tsars troops pulled back... They burned their own villages and fields only to prevent the invaders to get supplies and food. Therefore, tens of thousands of Napoleons soldiers died from starvation, heat, and disease Napoleon still meet the Russians in battle though, but he lost many men

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