As nomadic group of people which belonged to the region around the Capsian Sea, The Huns were responsibles for the Great Migration<em>.</em>
With brutal invasions of the regions sorrounding the Roman Empire, this tribe encouraged such migration, also known as the "Wandering of the Nations", which began between 300 and 700 CE, and was formed by the Alans, Goths, and Vandals among others.
They moved fast and were successful at battle. In 370 CE, they defeated and conquered the Alans, by 376 CE had pushed the Goths into Roman territory, and by 379 CE had pushed the people under the leadership of Athanaric into the Caucalands. These attacks produced a <em>domino effect </em>since many tribes, in their escape, sought refuge in Roman territory.
Such migration altered the conditions of roman society and eventually, after many insurrections and raids from these tribes, the Western Empire was weakened and collapsed.
Napoleon supported many principles of enlightenment such as sovereignty, trial by jury, equality before the law, a citizen army, freedom of religion, abolition of feudal privileges, and freedom of the press.
Answer:
The main reason was the revolt of his army. Fearing the prospect of facing other large armies and exhausted by years of campaigning, Alexander's army mutinied at the Hyphasis River (Beas), refusing to march farther east.
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