Late Romans mostly Celt?

[Tarbicus]

It is obvious Caesar did his nasty deeds there for himself only as many senators surmised. It was an illegal act according to some senators and one that brought about ruin and loss of a valued trading partner, besides losing a very effective buffer.

It did take roughly eight years for the Senate to try to put a halt to Caesar's conquest of Gaul, and even Pompey Magnus sent him troops, so I would say that if Caesar was guilty then so was the Senate. The loss of the trade I would suggest was secondary to reaping taxes from subject peoples, on whom trade would be forced anyway through colonisation - wherever the army went so did the traders and merchants.

My Celt Friend says what he meant was that there were so many Celts that they were easily the majority in the late Roman army but not the only group of course.

You have a point IMHO, and it's been said a few times now on RAT. I personally feel it is *one* of the main influences in the choices of weapons, tactics and armour, but a very gradual one.