While I'm not actually German, I'm entirely Germanic: English, Dutch, Danish, Norwegian, and Swedish. All my ancestry lies with those the likes of the ancient Saxons, Angles, Jutes, Franks, and Goths. All started as migrants spurred westward by still really unknown causes. Some have suggested extreme cold weather as an impetus for the migrations, others the pressure of other tribal peoples behind them in the East. I doubt we'll ever know for sure.
There's a debate over whether the Germans' movement was an invasion or a migration. I think that the sacking of cities and the conquest of various provinces sort puts them in the invader category. So between my ancient German roots and my later Scandinavian ones, my background consists of barbarians and reavers. Nice.
German warriors 1st cent. BC - 1st cent. AD
Allamani 3rd - 4th cent. AD
Visigoth 5th cent. AD
Saxon 5th - 6th cent. AD
Frank 8th cent. AD
Vikings 9th - 10th cent. AD
Eastern Vikings 10th - 11th cent. AD