Read the posts carefully. You're putting words in my mouth.
I never mentioned "independent Celtic tribes" from Scotland or Ireland - I mentioned the Celtic people known as Gauls, who collaborated with the Swabian invasion of Cisalpine Gaul.
My original post said that the Gauls reconquered some territory from the Romans - not that tribes from Ireland or Scotland invaded Roman territory.
"I never mentioned "independent Celtic tribes" from Scotland or Ireland - I mentioned the Celtic people known as Gauls, who collaborated with the Swabian invasion of Cisalpine Gaul."
Sorry I misread your posting. I guess the 300's you are referring to were 300 B.C. as iin the 300 A.D. period all of Gaul had long been a Roman province and the population thoroughly Romanized. Is that correct?