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These loitering soldiers would be called undisciplined, yes? This was the case for the soldiers of the Roman Empire... they did what they want because they had weak command. Part of the problem was there was really only one class of people present in the military. It was a bummer to be in the lower class! ALSO: Military became the only source of ruling eventually.

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Things weren't able to be recovered from as easily in the time of the Roman Empire as today. Pompeii is a prime example of a detrimental natural disaster.

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There was corruption in the government, and the people in charge were seen as starting to only care about themselves. Because of this and other things (like high taxes, dwindling economy) the lower class became fed up with the upper class.

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The Huns invaded the Roman Empire, whose military was already falling apart. They were after the Germanics, who went to Rome for protection.