Hannibal lays waste the country between the city Cortona and the lake Trasimenus, with all the devastation of war, the more to exasperate the enemy to revenge the injuries inflicted on his allies. They had now reached a place formed by nature for an ambuscade, where the Trasimenus comes nearest to the mountains of Cortona. A very narrow passage only intervenes, as though room enough just for that purpose had been left designedly; after that a somewhat wider plain opens itself, and then some hills rise up. On these he pitches his camp, in full view, where he himself with his Spaniards and Africans only might be posted. The Baliares and his other light troops he leads round the mountains; his cavalry he posts at the very entrance of the defile, some eminences conveniently concealing them; in order that when the Romans had entered, the cavalry advancing, every place might be enclosed by the lake and the mountains. Flaminius, passing the defiles before it was quite daylight, without reconnoitering, though he had arrived at the lake the preceding day at sunset, when the troops began to be spread into the wider plain, saw that part only of the enemy which was opposite to him; the ambuscade in his rear and overhead escaped his notice. And when the Carthaginian had his enemy enclosed by the lake and mountains, and surrounded by his troops, he gives the signal to all to make a simultaneous charge; and each running down the nearest way, the suddenness and unexpectedness of the event was increased to the Romans by a mist rising from the lake, which had settled thicker on the plain than on the mountains; and thus the troops of the enemy ran down from the various eminences, sufficiently well discerning each other, and therefore with the greater regularity. A shout being raised on all sides, the Roman found himself surrounded before he could well see the enemy; and the attack on the front and flank had commenced ere his line could be well formed, his arms prepared for action, or his swords unsheathed.

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The consul, while all were panic-struck, himself sufficiently undaunted though in so perilous a case, marshals, as well as the time and place permitted, the lines which were thrown into confusion by each man's turning himself towards the various shouts; and wherever he could approach or be heard exhorts them, and bids them stand and fight: for that they could not escape thence by vows and prayers to the gods but by exertion and valour; that a way was sometimes opened by the sword through the midst of marshalled armies, and that generally the less the fear the less the danger. However, from the noise and tumult, neither his advice nor command could be caught; and so far were the soldiers from knowing their own standards, and ranks, and position, that they had scarce sufficient courage to take up arms and make them ready for battle; and certain of them were surprised before they could prepare them, being burdened rather than protected by them; while in so great darkness there was more use of ears than of eyes. They turned their faces and eyes in every direction towards the groans of the wounded, the sounds of blows upon the body or arms, and the mingled clamours of the menacing and the affrighted. Some, as they were making their escape, were stopped, having encountered a body of men engaged in fight; and bands of fugitives returning to the battle, diverted others. After charges had been attempted unsuccessfully in every direction, and on their flanks the mountains and the lake, on the front and rear the lines of the enemy enclosed them, when it was evident that there was no hope of safety but in the right hand and the sword; then each man became to himself a leader, and encourager to action; and an entirely new contest arose, not a regular line, with principes, hastati, and triarii; nor of such a sort as that the vanguard should fight before the standards, and the rest of the troops behind them; nor such that each soldier should be in his own legion, cohort, or company: chance collects them into bands; and each man's own will assigned to him his post, whether to fight in front or rear; and so great was the ardour of the conflict, so intent were their minds upon the battle, that not one of the combatants felt an earthquake which threw down large portions of many of the cities of Italy, turned rivers from their rapid courses, carried the sea up into rivers, and levelled mountains with a tremendous crash.

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The battle was continued near three hours, and in every quarter with fierceness; around the consul, however, it was still hotter and more determined. Both the strongest of the troops, and himself too, promptly brought assistance wherever he perceived his men hard pressed and distressed. But, distinguished by his armour, the enemy attacked him with the utmost vigour, while his countrymen defended him; until an Insubrian horseman, named Ducarius, knowing him also by his face, says to his countrymen, "Lo, this is the consul who slew our legions and laid waste our fields and city. Now will I offer this victim to the shades of my countrymen, miserably slain;" and putting spurs to his horse, he rushes through a very dense body of the enemy; and first slaying his armour-bearer, who had opposed himself to his attack as he approached, ran the consul through with his lance; the triarii, opposing their shields, kept him off when seeking to despoil him. Then first the flight of a great number began; and now neither the lake nor the mountains obstructed their hurried retreat; they run through all places, confined and precipitous, as though they were blind; and arms and men are tumbled one upon another. A great many, when there remained no more space to run, advancing into the water through the first shallows of the lake, plunge in, as far as they could stand above it with their heads and shoulders. Some there were whom inconsiderate fear induced to try to escape even by swimming; but as that attempt was inordinate and hopeless, they were either overwhelmed in the deep water, their courage failing, or, wearied to no purpose, made their way back, with extreme difficulty, to the shallows; and there were cut up on all hands by the cavalry of the enemy, which had entered the water. Near upon six thousand of the foremost body having gallantly forced their way through the opposing enemy, entirely unacquainted with what was occurring in their rear, escaped from the defile; and having halted on a certain rising ground, and hearing only the shouting and clashing of arms, they could not know nor discern, by reason of the mist, what was the fortune of the battle. At length, the affair being decided, when the mist, dispelled by the increasing heat of the sun, had cleared the atmosphere, then, in the clear light, the mountains and plains showed their ruin and the Roman army miserably destroyed; and thus, lest, being descried at a distance, the cavalry should be sent against them, hastily snatching up their standards, they hurried away with all possible expedition. On the following day, when in addition to their extreme sufferings in other respects, famine also was at hand, Maharbal, who had followed them during the night with the whole body of cavalry, pledging his honour that he would let them depart with single garments, if they would deliver up their arms, they surrendered themselves; which promise was kept by Hannibal with Punic fidelity, and he threw them all into chains.

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