At the onset of the battle, the Roman and Carthaginian skirmishers began to pick at each other, testing for weaknesses and trying to force their opponent into committing to a plan of action (Lazenby, 1978). It wasn't until Hannibal's heavy cavalry charged the Roman right flank that the battle began in earnest. Hasdrubal's 7,000 Spanish and Gallic heavy cavalry collided with Paullus' 2,400 Italian heavy cavalry (Peddie, 1997). Immediately, the sheer force of numbers began driving the Romans back. To make matters worse, the river to their right and the infantry to their left effectively hemmed in the Romans. Many left their horses to fight on foot, allowing riderless horses to plunge unchecked through the Roman lines, causing further confusion (Lamb, 1960). The Romans were soon routed and began fleeing back towards their main camp and up the hill to Cannae. Hasdrubal successfully maintained command of his troops and rode behind the advancing Roman infantry and assisted the Numidians attack the Roman allied cavalry (de Beer, 1969).
On Rome's left flank, Varro held his ground against the Numidian light cavalry. His troops did not ride after the fleet, shaggy mounts of the Africans, but instead braved their pulsing style of attack. Indeed, Varro was effectively and efficiently upholding his initial plan of having his cavalry withstand attack until his infantry could break the Carthaginian center. However, when Hasdrubal's heavy cavalry threatened his right flank, Varro and his men rode with haste from the field. The Numidians gave chase while yet again Hasdrubal reformed his troops for attack (Lazenby, 1978).At the onset of the initial cavalry rush, the skirmishers for both sides melted back into their respective lines. The formation presented to the Romans was unique. Hannibal's Gauls and Spanish troops were arrayed in a convex line, with the outermost point closest to the Roman legions. Intent on destroying their enemy, the Romans began their steady, tightly maintained march towards the Carthaginian forces. The Gauls and Spaniards fought valiantly, but had to give ground due to the sheer number of Roman troops. As they made their slow retreat, their line flexed backward from convex to straight, and then finally concave. Meanwhile, the impetus of the Roman's forward advance carried them between the two African heavy infantry forces (Caven, 1980). Paullus, after the routing of his cavalry, assisted in leading the Romans towards their foe. As the front line of the Romans began to tire and meet continual resistance from the Gallic and Spanish troops, they realized they had nowhere to go for retreat. By that time, the Gauls and Spaniards had been pushed to the rear of their battle lines. They had yielded ground, but never broke before the Roman legions. The Roman advance slowly ground to a halt as those in front were stymied while those behind continually pressed forward.
At this time, Hannibal signaled the final stage of his battle plan. With the sound of war horns, the heavy African infantry wheeled towards each other and began attacking the Roman flanks (Caven, 1980). Meanwhile, the Gauls and Spaniards redoubled their efforts and applied pressure to the Italian front ranks. It was also at this time that Hasdrubal's heavy cavalry crashed into the back of the Roman infantry, effectively sealing off any avenues of escape. As the Romans vainly sought to free themselves from this perfectly executed double envelopment, the battle turned into a massacre.
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