Final answer:
Napoleon's invasion of Russia resulted in the loss of most of the Grand Army.
Step-by-step explanation:
The answer to the question is OD) The loss of most of the Grand Army. Napoleon's invasion of Russia in 1812 resulted in the loss of most of the Grand Army. The harsh Russian winter and guerrilla warfare tactics led to the defeat and retreat of the French forces, resulting in substantial casualties and loss of soldiers.
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