sentences:  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.The Tencteri and Usipetes sent ambassadors to Caesar as he advanced.