In accordance with the informations he had received, Cæsar sent out a reconnoitring party of scouts and centurions, charged with the selection of a spot favourable for the establishment of a camp. A certain number of the Belgæ, who had recently submitted, and other Gauls, followed him, and accompanied him in his march. Some of them, as was known subsequently by the prisoners, having observed during the preceding days the usual order of march of the army, deserted during the night to the Nervii, and informed them that behind each of the legions there was a long column of baggage; that the legion which arrived first at the camp being separated by a great space from the others, it would be easy to attack the soldiers, still charged with their bundles (sarcinæ); that this legion once routed and its baggage captured, the others would not dare to offer any resistance. This plan of attack was the more readily embraced by the Belgæ, as the nature of the locality favoured its execution. The Nervii, in fact, always weak in cavalry (their whole force was composed of infantry), were accustomed, in order to impede more easily the cavalry of their neighbours, to notch and bend horizontally young trees, the numerous branches of which, interlaced and mingled with brambles and brushwood, formed thick hedges, a veritable wall which nothing could pass through, impenetrable even to the eye.260 As this kind of obstacle was very embarrassing to the march of the Roman army, the Nervii resolved to hide themselves in the woods which then covered the heights of Haumont, to watch there the moment when it would debouch on the opposite heights of the Sambre, to wait till they perceived the file of baggage, and then immediately to rush upon the troops which preceded.261 (See Plate 10.)
Battle on the Sambre.
VII. The centurions sent to reconnoitre had selected for the establishment of the camp the heights of Neuf-Mesnil. These descend in a uniform slope to the very banks of the river. Those of Boussières, to which they join, end, on the contrary, at the Sambre, in sufficiently bold escarpments, the elevation of which varies from five to fifteen mètres, and which, inaccessible near Boussières, may be climbed a little lower, opposite the wood of Quesnoy. The Sambre, in all this extent, was no more than about three feet deep. On the right bank, the heights of Haumont, opposite those of Neuf-Mesnil, descend on all sides in gentle and regular slopes to the level of the river. In the lower part, they were bare for a breadth of about 200 Roman paces (300 mètres), reckoning from the Sambre; and then the woods began, which covered the upper parts. It was in these woods, impenetrable to the sight, that the Belgæ remained concealed. They were there drawn up in order of battle: on the right, the Atrebates; in the centre, the Veromandui; on the left, the Nervii; these latter facing the escarpments of the Sambre. On the open part, along the river, they had placed some posts of cavalry. (See Plate 10.)
Cæsar, ignorant of the exact position where the Belgæ were encamped, directed his march towards the heights of Neuf-Mesnil. His cavalry preceded him, but the order of march was different from that which had been communicated to the Nervii by the deserters; as he approached the enemy, he had, according to his custom, united six legions, and placed the baggage in the tail of the column, under the guard of the two legions recently raised, who closed the march.
The cavalry, slingers, and archers passed the Sambre and engaged the cavalry of the enemy, who at one moment took refuge in the woods, and at another resumed the offensive, nor were ever pursued beyond the open ground. Meanwhile, the six legions debouched. Arrived on the place chosen for the camp, they began to retrench, and shared the labour among them. Some proceeded to dig the fosses, while others spread themselves over the country in search of timber and turf. They had hardly begun their work, when the Belgæ, perceiving the first portion of the baggage (which was the moment fixed for the attack), suddenly issue from the forest with all their forces, in the order of battle they had adopted, rush upon the cavalry and put it to rout, and run towards the Sambre with such incredible rapidity that they seem to be everywhere at once – at the edge of the wood, in the river, and in the midst of the Roman troops; then, with the same celerity, climbing the hill, they rush towards the camp, where the soldiers are at work at the retrenchments. The Roman army is taken off its guard.
Cæsar had to provide against everything at the same time. It was necessary to raise the purple standard as the signal for hastening to arms,262 to sound the trumpets to recall the soldiers employed in the works, to bring in those who were at a distance, form the lines, harangue the troops, give the word of order.263 In this critical situation, the experience of the soldiers, acquired in so many combats, and the presence of the lieutenants with each legion, helped to supply the place of the general, and to enable each to take, by his own impulse, the dispositions he thought best. The impetuosity of the enemy is such that the soldiers have time neither to put on the ensigns,264 nor to take the covering from their bucklers, nor even to put on their helmets. Each, abandoning his labours, runs to range himself in the utmost haste under the first standard which presents itself.
The army, constrained by necessity, was drawn up on the slope of the hill, much more in obedience to the nature of the ground and the exigencies of the moment than according to military rules. The legions, separated from one another by thick hedges, which intercepted their view, could not lend each other mutual succour; they formed an irregular and interrupted line: the 9th and 10th legions were placed on the left of the camp, the 8th and 11th in the centre, the 7th and 12th on the right. In this general confusion, in which it became as difficult to carry succour to the points threatened as to obey one single command, everything was ruled by accident.
Cæsar, after taking the measures most urgent, rushes towards the troops which chance presents first to him, takes them as he finds them in his way, harangues them, and, when he comes to the 10th legion, he recalls to its memory, in a few words, its ancient valour. As the enemy was already within reach of the missiles, he orders the attack; then, proceeding towards another point to encourage his troops, he finds them already engaged.
The soldiers of the 9th and 10th legions throw the pilum, and fall, sword in hand, upon the Atrebates, who, fatigued by their rapid advance, out of breath, and pierced with wounds, are soon driven back from the hill they have just climbed. These two legions, led no doubt by Labienus, drive them into the Sambre, slay a great number, cross the river at their heels, and pursue them up the slopes of the right bank. The enemy, then thinking to take advantage of the commanding position, form again, and renew the combat; but the Romans repulse them anew, and, continuing their victorious march, take possession of the Gaulish camp. In the centre, the 8th and 11th legions, attacked by the Veromandui, had driven them back upon the banks of the Sambre, to the foot of the heights, where the combat still continued.
While on the left and in the centre victory declared for the Romans, on the right wing, the 7th and 12th legions were in danger of being overwhelmed under the efforts of the whole army of the Nervii, composed of 60,000 men. These intrepid warriors, led by their chief, Boduognatus, had dashed across the Sambre in face of the escarpments of the left bank; they had boldly climbed these, and thrown themselves, in close rank, upon the two legions of the right wing. These legions were placed in a position the more critical, as the victorious movements of the left and centre, by stripping almost entirely of troops that part of the field of battle, had left them without support. The Nervii take advantage of these circumstances: some move towards the summit of the heights to seize the camp, others outflank the two legions on the right wing (aperto latere).
As chance would have it, at this same moment, the cavalry and light-armed foot, who had been repulsed at the first attack, regained pell-mell the camp; finding themselves unexpectedly in face of the enemy, they are confounded, and take to flight again in another direction. The valets of the army, who, from the Decuman gate and the summit of the hill, had seen the Romans cross the river victoriously,