Free Dividing the Spoils: The War for Alexander the Great's Empire by Robin Waterfield

line. The phalanxes occupied the center, the cavalry was divided between the wings, and the light infantry and elephants were posted out in front. If there was broken terrain on one of the wings, mobile infantry might be posted there instead of cavalry. After the light infantry had expended their missiles, one side or both would make a general advance, either in a straight line or obliquely, favoring one wing or theother. Typically, it would be the right wing that was weighted with more shock troops than the other and would lead the attack. For Greeks and Macedonians, the right wing was the place of honor, and this was where the king or commander tended to take up his position. Ancient generals still fought from the front.
    The formulaic layout of the troops meant that, provided numbers were more or less equal, each type of contingent was most likely to clash first with its opposite number: cavalry fought cavalry, phalanx clashed with phalanx. Normally, it was only in the event of success or failure, or of ambush, that they would find themselves fighting dissimilar troop types. Commanders usually committed all or the vast majority of their troops at once, rarely holding any in reserve. One fundamental tactic, then, was for the winners of the cavalry engagement to try not to race so far off the battlefield that they were unable to return and support the central phalanx.
    Elephants were newcomers to Greek or Macedonian battlefields in the early Hellenistic period. Alexander’s eastern conquests had first brought them to western attention, as he met them in battle against both the Persians and the Indians. They were as important and unreliable as the new armored tanks of World War I. Apart from serving as a potent symbol of a war leader’s might and raising the morale of men who felt secure that they had these awesome beasts on their side, they had two main military purposes. Their defensive purpose depended chiefly on the fact that their smell and sight upset horses, so that they could blunt a cavalry assault. Their aggressive purpose was to disrupt the enemy lines, either by trampling them or simply by terrifying them into falling back, while archers riding behind the mahouts fired down on their foes. If both sides had elephants, a terrifying spectacle followed, which was witnessed by one ancient historian: “Elephants fight by tangling and locking their tusks together, and then pushing hard while leaning into each other, trying to gain ground, until one overpowers the other and pushes its trunk aside, thereby exposing its opponent’s flank. The stronger elephant then gores its opponent, using its tusks as a bull does his horns.” 4
    Pitched battles were often decisive, and sometimes armies would maneuver for days or weeks before meeting in full battle, knowing that the outcome of the war, and the future of their state, might well depend on it. Battles were generally over within a few hours. In the event of a rout, casualties could be appalling, but in the era of the Successors mass surrender was common; defeated troops were likely simply to join the enemy army. After all, the opposing commander had justproved himself potentially a better paymaster than their previous commander had been.
THE INVASION OF EGYPT
     
    Eumenes had won a notable victory—but the news did not reach Egypt in time to make a difference. Perdiccas was having a hard time of it. He had never managed to win the confidence of his men, and the expedition was plagued by desertion. Ptolemy undoubtedly had a very active fifth column within Perdiccas’s camp, and many of the officers as well as the rank-and-file troops were not convinced of the wisdom of attacking Ptolemy, or of the necessity for civil war. But Perdiccas stuck at the task and by May or June 320 was not far from the capital, Memphis. Then disaster struck.
    Memphis was on the farther, western side of the Nile, but Perdiccas managed to find a place where he could cross the river unopposed. As