High Quality Content by WIKIPEDIA articles! Vellaunodunum was a Gallic oppidum of the Senones tribe two days` march from Agedincum. On the outbreak of Vercingetorix`s revolt in 52 BC, Julius Caesar marched to this oppidum to besiege it, "in order that he might not leave an enemy in his rear, and might the more easily procure supplies of provisions". In his own words, he :