Final answer:
New invaders after the fall of Charlemagne's empire included the Vikings in the north, the Saracens from the south, and the Magyars from the east, who specifically launched devastating raids into Germany.
Step-by-step explanation:
After Charlemagne's empire began to disintegrate, several new invaders emerged to attack different parts of the former empire. The Vikings targeted Northern Europe, the Saracens from North Africa launched raids into Southern Europe including a notable sacking of churches on the outskirts of Rome, and from the steppes of central Asia, the Magyars swept into Europe, eventually settling in what is today Hungary. The Magyars were particularly aggressive towards the eastern regions such as Germany, and their raids continued until their defeat by Otto the Great at the Battle of Lechfeld in 955.