Caesar, fearing how the Gauls on the left bank might react, hurried to deal with this threat to his command of the region. He discovered that a number of Gaulish tribes had attempted to pay these Germani generously to leave, but the Tencteri and Usipetes had ranged further, coming to the frontiers of the Condrusi and Eburones, who were both under the protection of the Treveri to their south. Caesar convened a meeting of the Gaulish chiefs, and, pretending he did not know of their attempts at bribery, demanded cavalry and provisions for war against the Tencteri and Usipetes.