Rhine Crossing of 406: The Frontier Collapses
The Rhine had held for nearly four centuries as Rome's northwestern frontier. On 31 December 406 CE it failed catastrophically. The immediate cause was the frozen river: an unusually severe winter turned the Rhine into solid ice, eliminating the natural barrier. The deeper cause was the Hunnic expansion, which had been pushing Germanic peoples westward for three decades. When the river froze, the coalition crossed en masse. The Franks fought them but were overwhelmed. Roman resistance was minimal. The invaders fanned out across Gaul, sacking cities including Trier, Rheims, and Mainz. By 409 CE the Vandals, Alans, and Suebi had crossed the Pyrenees into Hispania. The Rhine crossing of 406 ended the coherent Roman frontier system in the West.
- Year: 406 CE
- Category: Military
