German-Sassanid alliance?

So I've been reading more and more Roman history lately, and it seems to me that if the Sassanid Empire and the Germans coordinated their assaults on Rome, they would have been able to defeat the Empire? Why didn't they do this in OTL? Were they not in contact? Also, would this have actually beaten Rome, or am I wrong?
 
The only thing I can see along those lines is maybe a coordinated Hunnic-Sassanian invasion strategy maybe working. But in general the Germanic states were far away and not really relevant to the interests of the Sassanians on the Syrian border.
 
So I've been reading more and more Roman history lately, and it seems to me that if the Sassanid Empire and the Germans coordinated their assaults on Rome, they would have been able to defeat the Empire? Why didn't they do this in OTL? Were they not in contact? Also, would this have actually beaten Rome, or am I wrong?
Given that the 'Germans' rarely coordinated with other 'Germans', trying to get the Germans unified enough to act as a single body is your first massive obstacle. THEN getting them to coordinate with the Sassanids, with whom they probably had no contact, that's another huge hurdle.
 
So I've been reading more and more Roman history lately, and it seems to me that if the Sassanid Empire and the Germans coordinated their assaults on Rome, they would have been able to defeat the Empire? Why didn't they do this in OTL? Were they not in contact? Also, would this have actually beaten Rome, or am I wrong?

First, WHICH Germans? Second, were they even aware of Sassanid's existence?
 
Okay, fair enough. Did the Sassanids have knowledge of the Germans at all, though? You'd think they'd choose a time when Rome was bogged down at the Rhine to attack.
 
Before the fall of the Western Empire, You might be able to get a crafty Sassanid emperor sending emissaries with gold to bribe the German tribes to attack Rome during a given time window, and sell it to them as an alliance of sorts. Afterwards, the Sassanids might get more of a consisten alliance with one or more of the post-Roman Germanic states - the Visigoths, the Burgundians, maybe the Franks, and so on - distant enough not to get into direct competition, strong enough to trouble the Eastern Romans.
 
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