jan 15, 390 BC - Rome sacked by Gauls

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as a result, worked to expand its defenses including the construction of the Servian Wall and restructuring of the military organization.
The Gauls were a Celtic people who lived to the north of Rome in the Po river valley. Following this tremendous defeat by the Gauls, the Romans began using better armor including iron helmets and spears. The Roman legion was reorganized into three lines of soldiers.

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