XXII. Caesar again returned to his troops in Gaul where he found much war in the country, for two great German nations had just crossed the Rhenus for the purpose of getting land; the one nation was called Usipes,[493] and the other Tenteritae. Respecting the battle with them, Caesar says in his Commentaries,[494] that the barbarians, while they were treating with him during a truce, attacked on their march and so put to flight his own cavalry to the number of five thousand with eight hundred of their own, for his men were not expecting an attack; that they then sent other ambassadors to him intending to deceive him again, whom he detained, and then led his army against the barbarians, considering all faith towards such faithless men and violators of truces to be folly. But Tanusius[495] says that while the senate were decreeing festivals and sacrifices for the victory, Cato delivered it as his opinion, that they ought to give up Caesar to the barbarians, and so purge themselves of the violation of the truce on behalf of the city, and turn the curse on the guilty man. Of those who had crossed the river there were slaughtered to the number of four hundred thousand, and the few who recrossed the river were received by the Sugambri[496] a German tribe. Caesar laying hold of this ground of complaint against the Germans, and being also greedy of glory and desirous to be the first man to cross the Rhenus with an army, began to build a bridge over the river, which was very broad, and in this part of the bed spread out widest, and was rough, and ran with a strong current so as to drive the trunks of trees that were carried down and logs of wood against the supports of the bridge,[497] and tear them asunder. But Caesar planted large timbers across the bed of the river above the bridge to receive the trees that floated down, and thus bridling the descending current, beyond all expectation he accomplished the completion of the bridge in ten days.