[210] To explain this rapid movement upon Besançon, we must suppose that Cæsar, at the moment when he received news of the march of Ariovistus, believed him to be as near Besançon as he was himself. In fact, Cæsar might fear that during the time the news had taken to reach him, the German king, who had already advanced three days’ journey out of his territory, might have arrived in the neighbourhood of Mulhausen or Cernay. Now Cæsar was at Arc-en-Barrois, 130 kilomètres from Besançon, and the distance from this latter town to Cernay is 125 kilomètres.
[211] The “Commentaries” give here the erroneous number DC: the breadth of the isthmus which the Doubs forms at Besançon cannot have undergone any sensible variation; it is at present 480 mètres, or 1,620 Roman feet. The copyists have, no doubt, omitted an M before DC.
[212] De Bello Gallico, I. 38.
[213] “ ... qui ex urbe, amicitiæ causa, Cæsarem secuti, non magnum in re militari usum habebant.” (De Bello Gallico, I. 39.)—We see in the subsequent wars Appius repairing to Cæsar to obtain appointments of military tribunes, and Cicero recommending for the same grade several persons, among others, M. Curtius, Orfius, and Trebatius. “I have asked him for a tribuneship for M. Curtius.” (Epist. ad Quint., II. 15; Epist. Famil., VII. 5, a letter to Cæsar.) Trebatius, though a bad soldier, was treated with kindness, and at once appointed a military tribune. “I wonder that you despise the advantages of the tribuneship, especially since they have allowed you to dispense with the fatigues of the military service.” (Cicero, Epist. Famil., VII. 8.)—“Resign yourself to the military service, and remain.” (Cicero, Epist. Famil., VII. 11.)—Trebatius appeared little satisfied, complained of the severity of the service, and, when Cæsar passed into Britain, he prudently remained on the Continent.
[214] Dio Cassius, XXXVIII. 36.
[215] This shows that then, in Italy, a great number of slaves were Germans.
[216] This Latin phrase indicated the putting the troops in march.
[217] De Bello Gallico, I. 41.
[218] There has been much discussion on the meaning of the words millium amplius quinquaginta circuitu. Some pretend that the number of fifty miles means the whole distance, and that thus Cæsar would have taken seven days to travel fifty miles, which would make about seven kilomètres a day: this supposition is inadmissible. Others pretend, on the contrary, that we must add fifty miles to the direct distance. This last interpretation is refuted by a passage in the “Commentaries” (De Bello Civili, I. 64). We read there, Ac tantum fuit in militibus studii, ut, millium vi. ad iter addito circuito, &c. This shows that when Cæsar means to speak of a turn of road, to be added to the total length of the route, he is careful to indicate it. We consider it more simple, therefore, to admit that the fifty miles are only a part of the distance performed during the seven days’ march; that is, that after making a circular détour of fifty miles, which required three or four days, Cæsar had still to march some time before he met the enemy, following the direct road from Besançon to the Rhine. The study of the ground completely justifies this view, for it was sufficient for Cæsar to make a circuit of fifty miles (or seventy-five kilomètres) to turn the mass of mountains which extends from Besançon to Montbéliard.
[219] It is probable that, during the negotiations, Ariovistus had approached nearer to the Roman camp, in order to facilitate intercommunication; for, if he had remained at a distance of thirty-six kilomètres from Cæsar, we should be obliged to admit that the German army, which subsequently advanced towards the Roman camp, in a single day, to within nine kilomètres, had made a march of twenty-five kilomètres at least, which is not probable when we consider that it dragged after it wagons and women and children.