Does it seem an easy matter for such a force to ward off this menace? No. The wing taken in rear in this way loses ground; more and more the contagion of fear spreads to the rest. Terror is so great that they do not think of re-forming in their camp, which is defended for a moment only by the cohorts on guard. Just as at Cannae, their arms drop from their hands. But for the good conduct of the camp guards which permitted the fugitives to gain the mountains, the twenty-four thousand prisoners of the next day might have been corpses that very day. Cannae and Pharsalus, are sufficient to illustrate ancient combat. Let us, however, add some other characteristic examples, which we shall select briefly and in chronological order. They will complete our data. [17] Livy relates that in an action against some of the peoples in the neighborhood of Rome, I do not recall now which, the Romans did not dare to pursue for fear of breaking their ranks. In a fight against the Hernici, he cites the Roman horsemen, who had not been able to do anything on horseback to break up the enemy, asking the consul for permission to dismount and fight on foot. This is true not only of Roman cavalrymen, for later on we shall see the best riders, the Gauls, the Germans, the Parthanians even, dismounting in order really to fight. The Volsci, the Latini, the Hernici, etc., combined to fight the Romans; and as the action nears its end, Livy relates: "Finally, the first ranks having fallen, and carnage being all about them, they threw away their arms and started to scatter. The cavalry then dashed forward, with orders not to kill the isolated ones, but to harass the mass with their arrows, annoy it, to delay it, to prevent dispersion in order to permit the infantry to come up and kill." In Hamilcar's engagement against the mercenaries in revolt, who up to then had always beaten the Carthaginians, the mercenaries endeavored to envelop him. Hamilcar surprised them by a new maneuver and defeated them. He marched in three lines: elephants, cavalry and light infantry, then heavily armed phalanxes. At the approach of the mercenaries who were marching vigorously towards him the two lines formed by the elephants, the cavalry and light infantry, turned about and moved quickly to place themselves on the flanks of the third line. The third line thus exposed met a foe which had thought only of pursuit, and which the surprise put to flight. It thus abandoned itself to the action of the elephants, horses and the light infantry who massacred the fugitives. Hamilcar killed six thousand men, captured two thousand and lost practically nobody. It was a question as to whether he had lost a single man, since there had been no combat. In the battle of Lake Trasimenus, the Carthaginians lost fifteen hundred men, nearly all Gauls; the Romans fifteen thousand and fifteen thousand prisoners. The battle raged for three hours.