Caesar's legions had been split up to put down more tribes, and his lieutenant Titus Labienus had with him 25 cohorts and a good deal of cavalry in the lands of the Treveri. The Germanic tribes had promised aid to the Treveri, and Labienus realized that his force (not even a legion strong) would be at a serious disadvantage. Thus, he sought to bait the Treveri into an attack on his terms. He did just so by feinting a withdrawal, and the Treveri took the bait. However, Labienus had made sure to feint up a hill, requiring the Treveri to run up it, so by the time they reached the top, they were exhausted. Labienus dropped the pretense of withdrawing and gave battle defeating the Treveri in minutes; the tribe surrendered shortly after. In the rest of Belgium, three legions raided the remaining tribes and forced widespread surrender, including the Eburones under Ambiorix. A punitive campaign against the Eburones and their allies, who were said to have been all but exterminated by the Romans, occupied the rest of 53 BC.