>>213828939''Germanics'' didn't conquer shit, they were let in the empire (which was already in severe decline by that point) as refugees since the huns were devastasting their territory. Once in the territory of the roman empire they chimped out and sacked Rome. By that time the ''roman'' army was like 50% made up of germanic foederati, it was basically germans fighting germans.
Whenever they tried to actually invade Italian territory during the times of roman empire they were always defeated (Cimbrian wars, Marcomanni wars, etc)