"In the year 280 B.C., the Gauls, under a celebrated chief whose title was the Brenn, prepared to invade Greece. Their army, composed of various tribes of Gauls and Kimry, amounted to 152,000 infantry and 61,000 cavalry. When this immense array reached the frontiers of Macedonia, a division broke out amongst their chiefs, and 20,000 men, detaching themselves from the main army, advanced into Thrace. The remainder, under the Brenn, precipitated themselves on Macedonia, routed the army which endeavoured to arrest their progress, and forced the remnant of the regular forces who survived, to take refuge in the fortified cities. During six months they ravaged with fire and sword the open country, and destroyed the unfortified towns of Macedonia and Thessaly. At the approach of winter, the Brenn collected his forces and established his camp in Thessaly, at a position near Mount Olympus. Thessaly is separated from Epirus and AEtolia by the chain of Pindus; and on the south, the almost impenetrable range of Mount Oeta divides it from the provinces of Hellas. The only pass by which an army can march into Greece is that of Thermopylae, which is a long narrow defile, overhung on the right by the rocks of Mount Oeta, and flanked on the left by impassable morasses, which finally lose themselves in the waters of the gulf of Mulia. A few narrow and difficult tracts traverse the ridge of Oeta; but these, though passable to a small body of infantry, present insurmountable obstacles to the advance of an army. To the pass of Thermopylae, in the spring of the year 280 B.C., the Brenn directed his march. Aware of its vital importance, the Athenians, Boeotians, Locrians, Phocians, and Megarians, who had formed a league against the northern invaders, collected a force of about 26,000 men, who, under the orders of Calippus, advanced to and occupied the strait, whilst 305 Athenian galleys, anchored in the bay of Mulia, were ready to operate upon the flank of the enemy. In his approach to this position, the Brenn had to pass the river Sperchius, to defend which Calippus had detached a small force: the Brenn, by a stratagem, directed their attention from the real point of attack, and crossed the river without loss. He then advanced to Heraclea, and laid waste the surrounding country. The day after his arrival at this place, he marched upon Thermopylae. Hardly had the Gauls begun to involve themselves in the pass, when they were encountered by the Greeks in its classic defile. With loud cries, and in one enormous mass, the Gauls rushed impetuously on; in silence, and in perfect order, the Greeks advanced to the charge. The phalanx of the south proved impenetrable to the sabre of the north; the pass