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When did Julius Caesar cross the Rhine River?

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Physical map of Western and Central Europe highlighting the drainage basins and networks of the Rhine, Rhone, and Seine rivers. The map shows river courses, major tributaries, canals, elevation changes with color shading, international boundaries, and key cities such as Paris, Lyon, Basel, and Rotterdam. A locator inset in the upper left corner places the main map within Europe.
Rhine River

Julius Caesar crossed the Rhine River on two separate occasions during his military campaigns in Gaul: first in 55 BCE and again in 53 BCE.12

It is important to distinguish these events from Caesar's more famous crossing of the Rubicon in 49 BCE. While the Rhine crossings were military raids into Germany, the crossing of the Rubicon was a politically defiant act that violated Roman law and triggered the Roman Civil War.3452