In 54 BC, Caesar's forces were still in Belgic territory, having just returned from their second expedition to Britain, and needed to be wintered. Crops had not been good, due to a drought, and this imposition upon the communities led to new conflict. This insurrection started only 15 days after a legion and five cohorts (one and a half legions) under the command of Caesar's legates, Quintus Titurius Sabinus and Lucius Aurunculeius Cotta arrived in their winter quarters in the country of the Eburones. The Eburones, encouraged by messages from the Treveran king Indutiomarus, and headed by their two kings, Ambiorix and Cativolcus, attacked the Roman camp; and after inducing the Romans to leave their stronghold on the promise of a safe passage, massacred nearly all of them (approximately 6000 men). Encouraged by this victory, Ambiorix rode personally first to the Aduatuci and then to the Nervi, arguing for a new attack on the Romans wintering in Nervian territory under the command by Quintus Tullius Cicero, brother of the famous orator. The Nervii agreed and summoned forces quickly from several tribes under their government, Centrones, Grudii, Levaci, Pleumoxii, and Geiduni. Caesar reported that this was thwarted by his timely intervention, and the Belgic allies dispersed, Caesar "fearing to pursue them very far, because woods and morasses intervened, and also he saw that they suffered no small loss in abandoning their position".