 Complete the following phrase:  The empire faced new waves of mass migrations likely triggered by the Huns westward expansion. Around 405, a mixed group of peoples invaded Italy under the command of a Gothic chieftain Radagaisus, but Stilicho overcame them at Florence. On 31 December 406, tens of thousands of Vandals, Alans, Suebi, Sarmatians and hostile Pannonians 