September 9, 9
A crucial battle in 9 CE where Germanic tribes under Arminius ambushed and annihilated three Roman legions led by Publius Quinctilius Varus, effectively halting Roman expansion into Germania and preserving Germanic independence.
September 4, 476
The Western Roman Empire officially ended when Germanic leader Odoacer deposed the last Roman emperor, Romulus Augustulus, marking the end of nearly 1,000 years of Roman dominance over Western Europe.