Soldiers' morale was low and there was a lack of discipline.
Russia has been a notoriously difficult country to invade, given its large size and generally large population throughout history. Freezing winters have also played a role in helping protect Russia, which was famously noted in 1812 during Napoleon's failed invasion of Russia. In response to European nations who saw the new French government as threat to the balance of powers, Napoleon annexed various parts of Europe and launched an invasion of Russia with over 600,000 soldiers. Napoleon invaded in the summer of 1812, but long fighting and a scorched earth policy by Russian forces prolonged the fighting and when a harsh winter arrived, the French army that lacked in supplies was reduced to under 100,000 soldiers. Eventually, Napoleon conceded his defeat, and left Russia in December, 1812.
C. How can I be a slave in a land where slavery does not exist?
In the case of Dred Scott, he was brought by his owner to the north. When there, he sued for his freedom, claiming that now that they were in a free state, his owner did not have the right to still 'own' him, since it was illegal in the state. However, the judge ruled that property continued to stay as property regardless of where the property is located at.
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Answer : offered freedom.