Germans cross the Rhine after Teutoburg

Could Arminius rally the Germanic Tribes with offers of loot and land in Gaul and try to invade Gaul in the aftermath of battle of Teutoburg forest

Could they successfully cross the Rhine

How would they do in Gaul
 
It's all contingent on what happening in Rome, I don't think there is enough instability to allow for such an invasion, I guess at best you could have a failure in the campaigns of Tiberius and Germanic and from there a weaker Roman political influence in Germania, probably avoding the creation of Agri Decumates.
 
The Germans weren't interested in Gaul at that time, they just wanted some booty and that was hard to do with the Romans setting military occupation in Germania
 
Could Arminius rally the Germanic Tribes with offers of loot and land in Gaul and try to invade Gaul in the aftermath of battle of Teutoburg forest

Could they successfully cross the Rhine

How would they do in Gaul

No. All he could was at most rallying a few more germanic tribes.

Crossing the Rhine on one point was still and always had been possible. But to achieve what ? In the end Romés defensive capacities would prevail at that time.
 
The fact that the Roman fort Aliso east of the Rhine - identified as either the excavated Roman fort at Haltern am See or at Bergkamen-Oberaden - was successfully held against a German siege shows that, had Arminius' troops crossed the Rhine, they could have invested other castra like Vetera, Novaesium or Bonna or towns like the Oppidum Ubiorum, but would most likely still have failed to take them.
 
Could Arminius rally the Germanic Tribes with offers of loot and land in Gaul and try to invade Gaul in the aftermath of battle of Teutoburg forest

Land? There was plenty on their side of the Rhine and it was almost empty compared to Gaul.
Loot? Possible.

Could they successfully cross the Rhine

If I'm not wrong Teutoburg took place from September 8th to September 11th. Was it possible to cross the Rhine in that period?
Also I think that on the first day the weather was quite terrible.

How would they do in Gaul

Not bad. If we assume that they could cross the Rhine twice (Otherwise they would be stuck in Gaul.) it is not hard to imagine them pillaging the countryside and going back home with food supplies.


If Arminius decided to cross the Rhine with some troops it would definitely only be a raid to sack some farmlands, not an invasion (That, I think, wouldn't be successful at all.).
 
Didn’t Arminius have a plan to unify the Germanic tribes between the Rhine and Elbe as a warlord? If he succeeds in rallying the tribes to a cause, he has to specify what sort of cause that is — given that Roman soldiers were raiding and sticking oars into Germania, they could come to the conclusion that it would be making it so that Rome can no longer interfere in German affairs, but that would take a substantial weakening of Rome’s offensive capability. Conclusion: an invasion of Gaul, not considering Arminius’ odds.
The Cherusci-led German tribal league would only be able to properly invade Gaul and succeed under specific circumstances, which might require a few spontaneous rebellions happening all at once. If Germanicus dies early, Rome falls to political instability after the death of Augustus, and the Illyrian revolt drags on, only then could Arminius have a chance at invading Gaul and inciting a local Celtic rebellion, imo.
 
Now there's a threat to Roman territory. Look for Augustus to send several legions to Gaul under a good general (Tiberius perhaps), and try to crush Arminius.
 
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