you do realize that independant berbers living in roman era north africa would often raid iberia, right? Those are not peaceful migrations the 40 BCE Mauretanian intervention in Iberia, all the Antonine Incursions (160s–170s CE) where berbers ravaged iberia for a good decade (171-179), as well as many other raids (212-305) Rome had ~5% of Morocco under control, the rest was savage berber tribes that acted the same way german did