PJ Media

And yet all those Germanic peoples still wanted to be Romans, and except for the Franks who decided they wanted to be Romans later on, they did their best to become Romans, including fighting and dying for Rome against various invaders.

And yet Italy was still invaded from the north, as well as from the sea, just as it was when Brennus sacked Rome with his Gauls, and just as when Hannibal invaded though he was defeated by a particular tactic.
It seems the Italian peninsula is not so easily defended after all.