Final answer:
The Gauls had a minor setback when they sacked Rome in 390 BCE, except for the Capitoline Hill. Archeological evidence supports this event.
Step-by-step explanation:
The Gauls were a formidable foe of Rome and had a minor setback when they sacked Rome in 390 BCE, except for the Capitoline Hill which Rome managed to defend. This event was an important moment in Roman history and showed the resilience of the Roman people under the leadership of Camillus who eventually expelled the Gauls.
There is archeological evidence of this setback. The Gauls' attack on Rome and the subsequent burning of the city left marks on the city's structures and artifacts. Archeological excavations have uncovered evidence of destruction and rebuilding in Rome, providing physical proof of the Gauls' invasion.
Overall, the Gauls' sack of Rome was a minor setback in the larger history of Rome and its conflicts with various tribes and civilizations.