XXIX.--Caesar, after he discovered through the Ubian scouts that the Suevi had retired into their woods, apprehending a scarcity of corn, because, as we have observed above, all the Germans pay very little attention to agriculture, resolved not to proceed any farther; but, that he might not altogether relieve the barbarians from the fear of his return, and that he might delay their succours, having led back his army, he breaks down, to the length of 200 feet, the farther end of the bridge, which joined the banks of the Ubii, and, at the extremity of the bridge raises towers of four stories, and stations a guard of twelve cohorts for the purpose of defending the bridge, and strengthens the place with considerable fortifications. Over that fort and guard he appointed C. Volcatius Tullus, a young man; he himself, when the corn began to ripen, having set forth for the war with 40 Ambiorix (through the forest Arduenna, which is the largest of all Gaul, and reaches from the banks of the Rhine and the frontiers of the Treviri to those of the Nervii, and extends over more than 500 miles), he sends forward L. Minucius Basilus with all the cavalry, to try if he might gain any advantage by rapid marches and the advantage of time, he warns him to forbid fires being made in the camp, lest any indication of his approach be given at a distance: he tells him that he will follow immediately. XXX.--Basilus does as he was commanded; having performed his march rapidly, and even surpassed the expectations of all, he surprises in the fields many not expecting him; through their information he advances towards Ambiorix himself, to the place in which he was said to be with a few horse. Fortune accomplishes much, not only in other matters, but also in the art of war. For as it happened by a remarkable chance, that he fell upon [Ambiorix] himself unguarded and unprepared, and that his arrival was seen by the people before the report or information of his arrival was carried thither; so it was an incident of extraordinary fortune that, although every implement of war which he was accustomed to have about him was seized, and his chariots and horses surprised, yet he himself escaped death. But it was effected owing to this circumstance, that his house being surrounded by a wood, (as are generally the dwellings of the Gauls, who, for the purpose of avoiding heat, mostly seek the neighbourhood of woods and rivers) his attendants and friends in a narrow spot sustained for a short time the attack of our horse. While they were fighting, one of his followers mounted him on a horse: the woods sheltered him as he fled. Thus fortune tended much both towards his encountering and his escaping danger.