XLIV.--Whilst he was considering these things an opportunity of acting successfully seemed to offer. For, when he had come into the smaller camp for the purpose of securing the works, he noticed that the hill in the possession of the enemy was stript of men, although, on the former days, it could scarcely be seen on account of the numbers on it. Being astonished, he inquires the reason of it from the deserters, a great number of whom flocked to him daily. They all concurred in asserting, what Caesar himself had already ascertained by his scouts, that the back of that hill was almost level; but likewise woody and narrow, by which there was a pass to the other side of the town; that they had serious apprehensions for this place, and had no other idea, on the occupation of one hill by the Romans, than that, if they should lose the other, they would be almost surrounded, and cut off from all egress and foraging; that they were all summoned by Vercingetorix to fortify this place. XLV.--Caesar, on being informed of this circumstance, sends several troops of horse to the place immediately after midnight; he orders them to range in every quarter with more tumult than usual. At dawn he orders a large quantity of baggage to be drawn out of the camp, and the muleteers with helmets, in the appearance and guise of horsemen, to ride round the hills. To these he adds a few cavalry, with instructions to range more widely to make a show. He orders them all to seek the same quarter by a long circuit; these proceedings were seen at a distance from the town, as Gergovia commanded a view of the camp, nor could the Gauls ascertain at so great a distance what certainty there was in the manoeuvre. He sends one legion to the same hill, and after it had marched a little, stations it in the lower ground, and conceals it in the woods. The suspicions of the Gauls are increased, and all their forces are marched to that place to defend it. Caesar, having perceived the camp of the enemy deserted, covers the military insignia of his men, conceals the standards, and transfers his soldiers in small bodies from the greater to the less camp, and points out to the lieutenants whom he had placed in command over the respective legions, what he should wish to be done; he particularly advises them to restrain their men from advancing too far, through their desire of fighting, or their hope of plunder; he sets before them what disadvantages the unfavourable nature of the ground carries with it; that they could be assisted by despatch alone: that success depended on a surprise, and not on a battle. After stating these particulars, he gives the signal for action, and detaches the Aedui at the same time by another ascent an the right.