Aduatuci

The Aduatuci or Atuatuci were, according to Caesar, a Germanic tribe who had been allowed to settle amongst the Germanic tribes living in east Belgium. They descended from the Cimbri and Teutones, who were tribes thought to have originated in the area of Denmark. Much later, the Aduatuci sent troops to assist their Belgic neighbours, especially the Nervii, in the Battle of the Sabis, but were too late. They were later defeated by the Romans after withdrawing to a fortified city. After their defeat by Caesar they disappear from the written record, but their survivors possibly contributed to the later tribal grouping known as the Tungri in Roman imperial times.

Before the Roman attack in 57 BC the oppidum of the Aduatuci (possible modern day Namur in Belgium or near the city of Thuin) were home to 57,000 including refugees fleeing the Romans. The oppidum of the Aduatuci were seized by the Romans and after the fall of the city with 4,000 dead the entire surviving population of 53,000 were sold as slaves.

The Cimbri, the Teutones, and Ambrones were engaged by, and then defeated, several Roman armies at the battle of Noreia (113 BCE) and at Arausio (105 BCE), where the Romans are said to have lost more than 80,000 men. After the Marian reforms of the legions, the Teutones and Ambrones were finally defeated by the Romans at Aquae Sextiae in 102 BC. The Cimbri were defeated by the Romans in northeast Italy in 101 BC. The Aduatuci were said to be the remnants of a group of the Cimbri who stayed in northern Gaul after defeating a previous Roman army under Marcus Junius Silanus in Gaul in 109 BC, before the Germanic tribes moved south towards Italy.

...
Wikipedia