This causes two great disorders to the enemy: the first, that he finds his strongest part surrounded: the second is, that as it appears to them they will obtain the victory quickly, it rarely happens that he will not become disorganized, whence his defeat quickly results. Cornelius Scipio, when he was in Spain, (fighting) against Hasdrubal, the Carthaginian, and knowing that Hasdrubal was noted, that in arranging the Army, placed his legions in the center, which constituted the strongest part of his Army, and therefore, when Hasdrubal was to proceed in this manner, afterwards, when he came to the engagement, changed the arrangement, and put his Legions in the wings of the Army, and placed his weakest forces in the center. Then when they came hand to hand, he quickly had those forces in the center to walk slowly, and the wings to move forward swiftly: so that only the wings of both armies fought, and the ranks in the center, being distant from each other, did not join (in battle), and thus the strongest part of (the army of) Scipio came to fight the weakest part of (that of) Hasdrubal, and defeated it.
This method at that time was useful, but today, because of the artillery, could not be employed, because that space that existed between one and the other army, gives them time to fire, which is most pernicious, as we said above. This method, therefore, must be set aside, and be used, as was said a short time ago, when all the Army is engaged, and the weaker part made to yield. When a Captain finds himself to have an army larger than that of the enemy, and not wanting to be prevented from surrounding him, arranges his Army with fronts equal to those of the enemy: then when the battle is started, has his front retire and the flanks extend little by little, and it will always happen that the enemy will find himself surrounded without being aware of it. When a Captain wants to fight almost secure in not being routed, he arranges his army in a place where he has a safe refuge nearby, either amid swamps or mountains or in a powerful city; for, in this manner, he cannot be pursued by the enemy, but the enemy cannot be pursued by him. This means was employed by Hannibal when fortune began to become adverse for him, and he was apprehensive of the valor of Marcus Marcellus.
Several, in order to disorganize the ranks of the enemy, have commanded those who are lightly armed, that they begin the fight, and having begun it, retire among the ranks; and when the Armies afterwards have joined fronts together, and each front is occupied in fighting, they have allowed them to issue forth from the flanks of the companies, and disorganized and routed them. If anyone finds himself inferior in cavalry, he can, in addition to the methods mentioned, place a company of pikemen behind his cavalry, and in the fighting, arrange for them to give way for the pikemen, and he will always remain superior. Many have accustomed some of the lightly armed infantry to get used to combat amidst the cavalry, and this has been a very great help to the cavalry.
Of all those who have organized Armies for battle, the most praiseworthy have been Hannibal and Scipio when they were fighting in Africa: and as Hannibal had his Army composed of Carthaginians and auxiliaries of various kinds, he placed eighty Elephants in the first van, then placed the auxiliaries, after these he placed his Carthaginians, and in the rear, he placed the Italians, whom he trusted little. He arranged matters thusly, because the auxiliaries, having the enemy in front and their rear closed by his men, they could not flee: so that being compelled to fight, they should overcome or tire out the Romans, thinking afterwards with his forces of virtu, fresh, he could easily overcome the already tired Romans. In the encounter with this arrangement, Scipio placed the Astati, the Principi, and the Triari, in the accustomed fashion for one to be able to receive the other, and one to help the other. He made the vans of the army full of intervals; and so that they should not be seen through, but rather appear united, he filled them with Veliti, whom he commanded that, as soon as the Elephants arrived, they should give way, and enter through the regular spaces among the legions, and leave the way open to the Elephants: and thus come to render their attack vain, so that coming hand to hand with them, he was superior.
ZANOBI:
You have made me remember in telling me of this engagement, that Scipio, during the fight, did not have the Astati retire into the ranks of the Principi, but divided them and had them retire into the wings of the army, so as to make room for the Principi, if he wanted to push them forward. I would desire, therefore, that you tell me what reason motivated him not to observe the accustomed arrangement.
Fabrizio:
I will tell you. Hannibal had placed all the virtu of his army in the second line; whence Scipio, in order to oppose a similar virtu to it, assembled the Principi and the Triari; so that the intervals of the Principi being occupied by the Triari, there was no place to receive the Astati, and therefore, he caused the Astati to be divided and enter the wings of the army, and did not bring them among the Principi. But take note that this method of opening up the first lines to make a place for the second, cannot be employed except when the other are superior, because then the convenience exists to be able to do it, as Scipio was able to.
But being inferior and repulsed, it cannot be done except with your manifest ruin: and, therefore, you must have ranks in the rear which will receive you. But let us return to our discussion. The ancient Asiatics [among other things thought up by them to injure the enemy] used chariots which had scythes on their sides, so that they not only served to open up the lines with their attack, but also kill the adversary with the scythes. Provisions against these attacks were made in three ways. It was resisted by the density of the ranks, or they were received within the lines as were the Elephants, or a stalwart resistance was made with some stratagems, as did Sulla, the Roman, against Archelaus, who had many of those chariots which they called Falcati; he (Sulla), in order to resist them, fixed many poles in the ground behind the first ranks, by which the chariots, being resisted, lost their impetus.
And note is to be taken of the new method which Sulla used against this man in arranging the army, since he put the Veliti and the cavalry in the rear, and all the heavily armed in front, leaving many intervals in order to be able to send those in the rear forward if necessity should require it; whence when the battle was started, with the aid of the cavalry, to whom he gave the way, he obtained the victory. To want to worry the enemy during the battle, something must be made to happen which dismays him, either by announcing new help which is arriving, or by showing things which look like it, so that the enemy, being deceived by that sight, becomes frightened; and when he is frightened, can be easily overcome. These methods were used by the Roman Consuls Minucius Rufus and Accilius Glabrius, Caius Sulpicius also placed many soldier-packs on mules and other animals useless in war, but in a manner that they looked like men-at-arms, and commanded that they appear on a hill while they were (in) hand to hand (combat) with the Gauls: whence his victory resulted.
Marius did the same when he was fighting against the Germans. Feigned assaults, therefore, being of great value while the battle lasts, it happens that many are benefited by the real (assaults), especially if, improvised in the middle of the battle, it is able to attack the enemy from behind or on the sides. Which can be done only with difficulty, unless the (nature of the) country helps you; for if it is open, part of your forces cannot be speeded, as must be done in such enterprises: but in wooded or mountainous places, and hence capable of ambush, part of your forces can be well hidden, so that the enemy may be assaulted, suddenly and without his expecting it, which will always be the cause of giving you the victory. And sometimes it has been very important, while the battle goes on, to plant voices which announce the killed of the enemy Captain, or to have defeated some other part of the army; and this often has given the victory to whoever used it.
The enemy cavalry may be easily disturbed by unusual forms (sights)