28.  Quinctius, when all his preparations were now sufficiently made, decamped; and, on the second day, came to Sellasia, on the river Oenus, on the spot where it is said Antigonus, king of Macedonia, fought a pitched battle with Cleomenes, tyrant of Lacedaemon.  Being told that the ascent from thence was difficult, and the passes narrow, he made a short circuit by the mountains, sending forward a party to make a road, and came, by a tolerably broad and open passage, to the river Eurotas, where it flows almost immediately under the walls of the city.  Here, the tyrant’s auxiliary troops attacked the Romans, while they were forming their camp, together with Quinctius himself, (who, with a division of cavalry and light troops, had advanced beyond the rest,) and threw them into a state of alarm and confusion; not expecting any thing of the kind, as no one had opposed them throughout their whole march, and they had passed, as it were, through a friendly territory.  The disorder lasted a considerable time, the infantry calling for aid on the cavalry, and the cavalry on the infantry, each having but little confidence in himself.  At length, the foremost ranks of the legions came up; and no sooner had the cohorts of the vanguard taken part in the fight, than those who had lately been an object of dread were driven back in terror into the city.  The Romans, retiring so far from the wall as to be out of the reach of weapons, stood there for some time in battle-array; and then, none of the enemy coming out against them, retired to their camp.  Next day Quinctius led on his army in regular order along the bank of the river, passed the city, to the foot of the mountain of Menelaus, the legionary cohorts marching in front, and the cavalry and light infantry bringing up the rear.  Nabis kept his mercenary troops, on whom he placed his whole reliance, in readiness, and drawn up in a body, within the walls, intending to attack the rear of the enemy; and, as soon as the last of their troops passed by, these rushed out of the town, from several places at once, with as great fury as the day before.  The rear was commanded by Appius Claudius, who having beforehand prepared his men to expect such an event, that it might not come upon them unawares, instantly made his troops face about, and presented an entire front to the enemy.  A regular engagement, therefore, took place, as if two complete lines had encountered, and it lasted a considerable time; but at length Nabis’s troops betook themselves to flight, which would have been attended with less dismay and danger, if they had not been closely pressed by the Achaeans, who were well acquainted with the ground.  These made dreadful havoc, and dispersing them entirely, obliged the greater part to throw away their arms.  Quinctius encamped near Amyclae; and afterwards, when he had utterly laid waste all the pleasant and thickly inhabited country round the city, not one of the enemy venturing out of the gates, he removed his camp to the river Eurotas.  From thence he ravaged the valley lying under Taygetus, and the country reaching as far as the sea.