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While you didn't provide any possible sources, we can expect that biased information would be found when you would look for information from people who are involved in the situation that is being discussed. Imagine a soldier from Germany discussing his viewpoint of World War II. He would most likely give you a biased account. At least, when compared to a postwar historical analysis of that same situation.
to serve their country? to have money? this is a blanket question i can try to answer it if you give me more detail.
Answer:
The answer is D. The army was merciful and fair to the cities that it conquered.
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