A History of Rome During the Later Republic and Early Principate

by A. H. J. Greenidge

Jugurtha's plan was based on the necessity which would confront the Romans of crossing this arid slope to reach the river. Could he spring on them as they left the mountain chain and detain them in this torrid wilderness, nature might do even more than the Numidian arms to secure a victory; meanwhile measures might be taken to close the passage to the river, and to bring up fresh forces from the east to block the desired route while the ambushed army was harassed by attacks from the flank and rear.

Jugurtha himself occupied the portion of the slope which lay just beneath the mountain. He kept under his own command the whole of the cavalry and a select body of foot-soldiers, probably of a light and mobile character such as would assist the operations of the horse. These he placed in an extended line on the flank of the route that must be followed by an army descending from the mountain. The line was continued by the forces which he had placed under the command of Bomilcar. These consisted of the heavier elements of the Numidian army, the elephants of war and the major part of the foot soldiers. It is, however, probable that there was a considerable interval between the end of Jugurtha's and the beginning of Bomilcar's line.[1012] The latter on its eastern side extended to a point at no great distance from the river; and according to the original scheme of the ambush the function assigned to Bomilcar must have been that of executing a turning movement which would prevent the Roman forces from gaining the stream. As it was expected that the impact of the heavy Roman troops would be chiefly felt in this direction, the sturdier and less mobile portions of the Numidian army had been placed under Bomilcar's command.

Metellus was soon seen descending the mountain slope,[1013] and there seemed at first a chance that the Roman column might be surprised along its length by the sudden onset of Jugurtha's horse. But the vigilant precautions which Metellus observed during his whole line of march, although they could not in this case avert a serious danger, possibly lessened the peril of the moment. His scouts seem to have done their work and spied the half-concealed Numidians amongst the low trees and brushwood. The superior position of the Roman army must in any case soon have made this knowledge the common property of all, unless we consider that some ridge of the chain concealed Jugurtha's ambush from the view of the Roman army until they should have almost left the mountain for the lower hill beneath it. Jugurtha must in any case have calculated on the probability of the forces under his own command soon becoming visible to the enemy, for perfect concealment was impossible amidst the stunted trees which formed the only cover for his men.[1014] The efficacy of his plan did not depend on the completeness or suddenness of the surprise; it depended still more on Jugurtha's knowledge of the needs of a Roman army, and on the state of perplexity into which all that was visible of the ambush would throw the commander. For the little that was seen made it difficult to interpret the size, equipment and intentions of the expectant force. Glimpses of horses and men could just be caught over the crests of the low trees or between the interlacing boughs. Both men and horses were motionless, and the eye that strove to see more was baffled by the scrub which concealed more than it revealed, and by the absence of the standards of war which might have afforded some estimate of the nature and size of the force and had for this reason been carefully hidden by Jugurtha.

But enough was visible to prove the intended ambush. Metellus called a short halt and rapidly changed his marching column to a battle formation capable of resistance or attack. His right flank was the one immediately threatened. It was here accordingly that he formed the front of his order of battle, when he changed his marching column into a fighting line.[1015] The three ranks were formed in the traditional manner; the spaces between the maniples were filled by slingers and archers; the whole of the cavalry was placed on the flanks. It is possible that at this point the line of descent from the mountain would cause the Roman army to present an oblique front to the slope and the distant river,[1016] and the cavalry on the left wing would be at the head of the marching column, if it descended into the lower ground.[1017] Such a descent was immediately resolved on by Metellus. To halt on the heights was impossible, for the land was waterless; an orderly retreat was perhaps discountenanced by the difficulties of the country over which he had just passed and the distance of the last watering-place which he had left, while to retire at the first sight of the longed-for foe would not have inspired his newly remodelled army with much confidence in themselves or their general.

When the army had quitted the foot of the mountain, a new problem faced its general. The Numidians remained motionless,[1018] and it became clear that no rapid attack that could be as suddenly repulsed was contemplated by their leader. Metellus saw instead the prospect of a series of harassing assaults that would delay his progress, and he dreaded the fierceness of the season more than the weapons of the enemy. The day was still young, for Jugurtha had meant to call in the alliance of a torrid sun, and Metellus saw in his mind's eye his army, worn by thirst, heat and seven miles of harassing combat, still struggling with the Numidian cavalry while they strove to form a camp at the river which was the bourne of their desires. It was all important that the extreme end of the slope which touched the river should be seized at once, and a camp be formed, or be in process of formation, by the time that his tired army arrived. With this object in view he sent on his legate Rutilius with some cohorts of foot soldiers in light marching order and a portion of the cavalry. The movement was well planned, for by the nature of the case it could not be disturbed by Jugurtha. His object was to harry the main body of the army and especially the heavy infantry, and his refusal to detach any part of his force in pursuit of the swiftly moving Rutilius is easily understood, especially when it is remembered that Bomilcar was stationed near to the ground which the Roman legate was to seize. An attack on the flying column would also have led to the general engagement which Metellus wished to provoke. The presence of Bomilcar and his force was probably unknown to the Romans. He in his turn must have been surprised, and may have been somewhat embarrassed, by Rutilius's advance; but the movement did not induce him to abandon his position. To oppose Rutilius would have been to surrender the part assigned him in the intended operations against the main Roman force; and, if this part was now rendered difficult or impossible by the presence of the Romans in his rear, he might yet divide the forces of the enemy, and assist Jugurtha by keeping Rutilius and his valuable contingents of cavalry in check. He therefore permitted the legate to pass him[1019] and waited for the events which were to issue from the combat farther up the field.

Metellus meanwhile continued his slow advance, keeping the marching order which had been observed in the descent from the mountain. He himself headed the column, riding with the cavalry that covered the left wing, while Marius, in command of the horsemen on the right, brought up the rear.[1020] Jugurtha waited until the last man of the Roman column had crossed the beginning of his line, and then suddenly threw about two thousand of his infantry up the slope of the mountain at the point where Metellus had made his descent. His idea was to cut off the retreat of the Romans and prevent their regaining the most commanding position in the field. He then gave the signal for a general attack. The battle which followed had all the characteristic features of all such contests between a light and active cavalry force and an army composed mainly of heavy infantry, inferior in mobility but unshakable in its compact strength. There was no possibility of the Numidians piercing the Roman ranks, but there was more than a possibility of their wearing down the strength of every Roman soldier before that weary march to the river had even neared its completion. The Roman defence must have been hampered by the absence of that portion of the cavalry which had accompanied Rutilius; it was more sorely tried by the dazzling sun, the floating dust and the intolerable heat. The Numidians hung on the rear and either flank, cutting down the stragglers and essaying to break the order of the Roman ranks on every side. It was of the utmost difficulty to preserve this order, and the braver spirits who preferred the security of their ranks to reckless and indiscriminate assault, were maddened by blows, inflicted by the missiles of their adversaries, which they were powerless to return. Nor could the repulse of the enemy be followed by an effective pursuit. Jugurtha had taught his cavalry to scatter in their retreat when pursued by a hostile band; and thus, when unable to hold their ground in the first quarter which they had selected for attack, they melted away only to gather like clouds on the flank and rear of pursuers who had now severed themselves from the protecting structure of their ranks. Even the difficulties of the ground favoured the mobile tactics of the assailants; for the horses of the Numidians, accustomed to the hill forests, could thread their way through the undergrowth at points which offered an effective check to the pursuing Romans.

It seemed as though Jugurtha's plan was nearing its fulfilment. The symmetry of the Roman column was giving place to a straggling line showing perceptible gaps through which the enemy had pierced. The resistance was becoming individual; small companies pursued or retreated in obedience to the dictates of their immediate danger; no single head could grasp the varied situation nor, if it had had power to do so, could it have issued commands capable of giving uniformity to the sporadic combats in which attack and resistance seemed to be directed by the blind chances of the moment. But every minute of effectual resistance had been a gain to the Romans. The ceaseless toil in the cruel heat was wearing down the powers even of the natives; the exertions of the latter, as the attacking force, must have been far greater than those of the mass of the Roman infantry; and the Numidian foot soldiers in particular, who were probably always of an inferior quality to the cavalry and had been obliged to strain their physical endurance to the utmost by emulating the horsemen in their lightning methods of attack and retreat, had become so utterly exhausted that a considerable portion of them had practically retired from the field. They had climbed to the higher ground, perhaps to join the forces which Jugurtha had already placed near the foot of the mountain, and were resting their weary limbs, probably not with any view of shirking their arduous service but with a resolution of renewing the attack when their vigour had been restored. This withdrawal of a large portion of the infantry was a cause, or a part, of a general slackening of the Numidian attack; and it was the breathing space thus afforded which gave Metellus his great chance. Gradually he drew his straggling line together and restored some order in the ranks; and then with the instinct of a true general he took active measures to assail his enemy's weakest point. This point was represented by the Numidian infantry perched on the height. Some of these were exhausted and perhaps dispirited, others it is true were as yet untouched by the toil of battle; but as a body Metellus believed them wholly incapable of standing the shock of a Roman charge. The confidence was almost forced on him by his despair of any other solution of the intolerable situation. The evening was closing in, his army had no camp or shelter; even if it were possible to guard against the dangers of the night, morning would bring but a renewal of the same miserable toil to an army worn by thirst, sleeplessness and anxiety. He, therefore, massed four legionary cohorts against the Numidian infantry,[1021] and tried to revive their shattered confidence by appealing at once to their courage and to their despair, by pointing to the enemy in retreat and by showing that their own safety rested wholly on the weapons in their hands. For some time the Roman soldiers surveyed their dangerous task and looked expectantly at the height that they were asked to storm. The vague hope that the enemy would come down finally disappeared; the growing darkness filled them with resolute despair; and, closing their ranks, they rushed for the higher ground. In a moment the Numidians were scattered and the height was gained. So rapidly did the enemy vanish that but few of them were slain; their lightness of armour and knowledge of the ground saved them from the swords of the pursuing legionaries.

The conquest of the height was the decisive incident of the battle, and it was clearly a success that, considered in itself, was due far more to radical and permanent military qualities than to tactical skill. It may seem wholly a victory of the soldiers, in which the general played no part, until we remember that strategic and tactical considerations are dependent on a knowledge of such permanent conditions, and that Metellus was as right in forcing his Romans up the height as Jugurtha was wrong in believing that his Numidians could hold it. With respect to the events occurring in this quarter of the field, Metellus had saved himself from a strategic disadvantage by a tactical success; but even the strategic situation could not be estimated wholly by reference to the events which had just occurred or to the position in which the two armies were now left. Had Bomilcar still been free to bar the passage to the river and to join Jugurtha's forces during the night, the position of the Romans would still have been exceedingly dangerous. But the mission of Rutilius had successfully diverted that general's attention from what had been the main purpose of the original plan. His leading idea was now merely to separate the two divisions of the Roman army, and the thought of blocking the passage of Metellus, although not necessarily abandoned, must have become secondary to that of checking the advance of Rutilius when the legate should have become alarmed at the delay in the progress of his commander. Bomilcar, after he had permitted the Roman force to pass him, slowly left the hill where he had been posted and brought his men into more level ground,[1022] while Rutilius was making all speed for the river. Quietly he changed his column into a line of battle stretching across the slope which at this point melted into the plain, while he learnt by constant scouting every movement of the enemy beyond. He heard at length that Rutilius had reached his bourne and halted, and at the same time the din of the battle between Jugurtha and Metellus came in louder volumes to his ear. The thought that Rutilius's attention was disengaged now that his main object had been accomplished, the fear that he might seek to bring help to his labouring commander, led Bomilcar to take more active measures. His mind was now absorbed with the problem of preventing a junction of the Roman forces. His mistrust of the quality of the infantry under his command had originally led him to form a line of considerable depth; this he now thought fit to extend with the idea of outflanking and cutting off all chance of egress from the enemy. When all was ready he advanced on Rutilius's camp.[1023]

The Romans were suddenly aware of a great cloud of dust which hung over the plantations on their landward side; but the intervening trees hid all prospect of the slope beyond: and for a time they looked on the pillar of dust as one of the strange sights of the desert, a mere sand-cloud driven by the wind. Then they thought that it betrayed a peculiar steadiness in its advance; instead of sweeping down in a wild storm it moved with the pace and regularity of an army on the march; and, in spite of its slow progress, it could be seen to be drawing nearer and nearer. The truth burst upon their minds; they seized their weapons and, in obedience to the order of their commander, drew up in battle formation before the camp. As Bomilcar's force approached, the Romans shouted and charged; the Numidians raised a counter cheer and met the assault half-way. There was scarcely a moment when the issue seemed in doubt. The Romans, strong in cavalry, swept the untrained Numidian infantry before them, and Bomilcar had by his incautious advance thrown away the utility of that division of his army on which he and his men placed their chief reliance. His elephants, which were capable of manoeuvring only on open ground, had now been advanced to the midst of wooded plantations, and the huge animals were soon mixed up with the trees, struggling through the branches and separated from their fellows.[1024] The Numidians made a show of resistance until they saw the line of elephants broken and the Roman soldiers in the rear of the protecting beasts; then they threw away their heavy armour and vanished from the spot, most of them seeking the cover of the hills and nearly all secure in the shelter of the coming night. The elephants were the chief victims of the Roman pursuit; four were captured and the forty that remained were killed.

It had been a hard day's work for the victorious division. A forced march had been followed by the labour of forming a camp and this in turn by the toil of battle. But it was impossible to think of rest. The delay of Metellus filled them with misgivings, and they advanced through the darkness to seek news of the main division with a caution that bespoke the prudent view that their recent victory had not banished the evil possibilities of Numidian guile.[1025] Metellus was advancing from the opposite direction and the two armies met. Each division was suddenly aware of a force moving against it under cover of the night; with nerves so highly strung as to catch at any fear each fancied an enemy in the other. There was a shout and a clash of arms, as swords were drawn and shields unstrung. It was fortunate that mounted scouts were riding in advance of either army. These soon saw the welcome truth and bore it to their companions. Panic gave place to joy; as the combined forces moved into camp, the soldiers' tongues were loosed, and pent up feelings found expression in wonderful stories of individual valour.