M. Manilius et Q. Caepio:
Quintus Servilius Caepio, a consul, had been sent in 106 BCE to confront these Northern threats.
He managed to recover the city, Tolosa,
located here in Gallia.
After this event, Gnaeus Mallius, a consul of 105 and a novus homo, i.e., someone who was
the first in his family to become consul, joined him. It was not M. Manlius as Eutropius reports.
victi sunt ... ingenti internicione:
Because Mallius would not cooperate with his superior, Caepio, the Romans suffered at a great loss
at the city,
Arausio, located
here near the Rhone River.
Some 80,000 men were lost.
Here is a map of the German invasions.
a Cimbris et Teutonis et Tugurinis et Ambronibus:
These are different German and Gallic tribes. The Cimbri were the main instigators in this war.
magnam partem exercitus:
"a great part of the army" — exercitus is being used as a partitive genitive
or a genitive of the whole. PartGen