Final answer:
The fall of Rome involved attacks from several barbarian groups, most notably the Goths, including the Visigoths and Ostrogoths, as well as the Vandals and the Sassanids from Persia. Internal political strife and weakened leadership also played roles in Rome's inability to resist these invaders.
Step-by-step explanation:
The fall of Rome was a significant event in history marked by attacks from various barbarian groups. These groups included the Goths, particularly the Visigoths, who breached Rome's walls for the first time in seven centuries. This event marked the start of a domino effect that saw numerous barbarian tribes enter Roman territory, leading to many disasters for the Empire.
The Huns' arrival in Europe pressured other barbarian groups into Roman territories, thus exacerbating the situation. As these tribes, such as the Ostrogoths and the Vandals, became more organized and populous, they posed increasingly serious threats to the Western Roman Empire.
Rome also grappled with internal strife and leadership issues, which weakened its ability to fend off these incursions. Another significant group that Rome faced were the Sassanids from Persia, who were more aggressive compared to their predecessors and demanded significant military attention from Rome.
Amidst these external pressures, Rome's own political turmoil contributed to its vulnerability. Ultimately, the city of Rome was sacked multiple times by various invading armies, leading to the Western Roman Empire's decline. Rome's supposed impregnability was proven a myth as the city was sacked by the Ostrogoths, Visigoths, and Vandals over the decades following the first breach of its walls by the Goths.