On August 8 , 121 BC the legions of Quintus Fabius Maximus defeated them and forced them to submit ; Maximus earned the cognomen Allobrogicus for this feat .
Rome declared war and moved against the Allobroges .
On August 8 , 121 BC the legions of Quintus Fabius Maximus defeated Allobroges and forced Allobroges to submit ; Maximus earned the cognomen Allobrogicus for this feat .
Rome declared war and moved against the Allobroges .