It shouldn't be forgotten that the germanic tribes raided succesful many years before the inner-gallic wars and defeated the gauls - as example under Ariovist...
Also we should not make the fault and believe in that great numbers of enemy warrios the romans mentioned while fighting the germanics.
Archaelogists could prove that the germanic homeland during he time we talk about was simply not furtile enough to give food to so many humans.
The theory about the germanic tribes outnumbering the settled gauls or romans is just wrong - at least in the border provinces.
It is a different thing with migration tribes as the Ambrones and the Cimbri and Teutoni, but even here you must subtract the numbers of childs, old men and women...
Also the germanic cavlary should be better than their gallic counterparts, but that is hard to implement as the germanic cavalry fought alongside fast moving infantrymen. Normally a fast running young warrior hold fast to the mane of the horse while charging the enemy cavalry andf while the horsemen fought against each other the men on foot were capable of killing their enemies horses.
A special tactic by the tribes -at least by the Suebians (Sweboz), that is sadly not in the game (model-wise not possible)
Interesting to note b.t.w. that the romans were very eager to enlist germanic cavlary after their war against King ariovist and his Suebians to fight for them against Vercingetorix and his gallic rebellion. I think one reason was that gallic cavalry feared the germanics and was usually (not ever) defeated.
The only thing i could imagine is giving the germanic light cavalry the fear ability to give them an advantage vs. their gallic counterparts.
The gothic horsemen is much to late for the EB mod.
Also while i agree with the lack of resources the germanic tribes had with iron, the plundered and raided in great numbers from the gauls. While it was sometimes heard of to sacrifice the whole equipment to the gods as the Cimbri did after defeating the romans it was more common to take the swords and use them in the oncoming fights.
In my opinion this is also a reason why there are so few swords found in germanic graves - those weapons were so highly demanded that they were given to their young warriors again and were not given to the dead as funeral items.
As ever - excuse my poor english

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