7.9.1At Caesar bīduum in hīs locīs morātus, quod haec dē Vercingetorīge ūsū ventūra opīniōne praecēperat, per causam supplēmentī equitātūsque cōgendī ab exercitū discēdit;But Caesar, after waiting two days in these parts, because he had guessed from experience that this would happen with regard to Vercingetorix, leaves the army on the pretext of gathering reinforcements and cavalry;Note. per causam: 'on the pretext of'. ūsū ventūra opīniōne praecēperat: 'he had foreseen in his mind that this would happen'. 7.9.1Brūtum adulēscentem hīs cōpiīs praeficit;he puts young Brutus in command of these forces; 7.9.2hunc monet, ut in omnēs partēs equitēs quam lātissimē pervagentur: datūrum sē operam, nē longius trīduō ab castrīs absit.he advises him that the cavalry should range as widely as possible in all directions: he himself would make sure not to be away from the camp longer than three days. 7.9.3Hīs cōnstitūtīs rēbus suīs inopīnantibus quam maximīs potest itineribus Viennam pervēnit.With these arrangements made, to the surprise of his own men he reaches Vienna by the longest marches he can.Note. suīs inopīnantibus: 'while his own men did not expect it'. quam maximīs potest itineribus: 'by the longest marches he could'. 7.9.4Ibi nactus recentem equitātum, quem multīs ante diēbus eō praemīserat, neque diurnō neque nocturnō itinere intermissō per fīnēs Aeduōrum in Lingonēs contendit, ubi duae legiōnēs hiemābant, ut, sī quid etiam dē suā salūte ab Aeduīs inīrētur cōnsilī, celeritāte praecurreret.There he finds fresh cavalry, which he had sent ahead there many days before, and without breaking his journey by day or night he hurries through the territory of the Aedui into the land of the Lingones, where two legions were wintering, so that if any plan against his own safety were being formed by the Aedui, he might forestall it by speed.
7.9.5Eō cum pervēnisset, ad reliquās legiōnēs mittit priusque omnēs in ūnum locum cōgit quam dē eius adventū Arvernīs nūntiārī posset.When he had arrived there, he sends to the other legions and gathers them all into one place before news of his arrival could be brought to the Arverni. 7.9.6Hāc rē cognitā Vercingetorīx rūrsus in Biturīgēs exercitum redūcit atque inde profectus Gorgobinam, Boiōrum oppidum, quōs ibi Helvēticō proeliō victōs Caesar collocāverat Aeduīsque attribuerat, oppugnāre īnstituit.When he learned this, Vercingetorix leads his army back into the land of the Bituriges, and setting out from there begins to besiege Gorgobina, a town of the Boii, whom Caesar had settled there after defeating them in the battle with the Helvetii, and had made subject to the Aedui.