Just as the Roman infantry commanded by Minucius reached the hill and was moving up the slopes, the Roman cavalry broke and began to scatter. The Roman light troops, already hard pressed, were also driven back on the marching legions. The Roman battle formation was disrupted, and before the Romans could regain cohesion, the Carthaginians concealed in the hollows emerged and fell on the exposed flanks and rear of the Roman battle line. Hannibal and his infantry struck the now unbalanced Romans from the front before the shock of the ambush faded or Minucius could take corrective action. Attacked from all sides, a part of the Romans broke ranks and fled, while the others became surrounded and were fighting for their lives.