Uniting here at daybreak, they sat down at the place called Metropolis, and encamped. Not long afterwards the Athenians in the twenty ships came into the Ambracian Gulf to support the Argives, with Demosthenes and two hundred Messenian heavy infantry, and sixty Athenian archers. While the fleet off Olpae blockaded the hill from the sea, the Acarnanians and a few of the Amphilochians, most of whom were kept back by force by the Ambraciots, had already arrived at Argos, and were preparing to give battle to the enemy, having chosen Demosthenes to command the whole of the allied army in concert with their own generals. Demosthenes led them near to Olpae and encamped, a great ravine separating the two armies. During five days they remained inactive; on the sixth both sides formed in order of battle. The army of the Peloponnesians was the largest and outflanked their opponents; and Demosthenes fearing that his right might be surrounded, placed in ambush in a hollow way overgrown with bushes some four hundred heavy infantry and light troops, who were to rise up at the moment of the onset behind the projecting left wing of the enemy, and to take them in the rear. When both sides were ready they joined battle; Demosthenes being on the right wing with the Messenians and a few Athenians, while the rest of the line was made up of the different divisions of the Acarnanians, and of the Amphilochian carters. The Peloponnesians and Ambraciots were drawn up pell-mell together, with the exception of the Mantineans, who were massed on the left, without however reaching to the extremity of the wing, where Eurylochus and his men confronted the Messenians and Demosthenes. The Peloponnesians were now well engaged and with their outflanking wing were upon the point of turning their enemy’s right; when the Acarnanians from the ambuscade set upon them from behind, and broke them at the first attack, without their staying to resist; while the panic into which they fell caused the flight of most of their army, terrified beyond measure at seeing the division of Eurylochus and their best troops cut to pieces. Most of the work was done by Demosthenes and his Messenians, who were posted in this part of the field. Meanwhile the Ambraciots (who are the best soldiers in those countries) and the troops upon the right wing, defeated the division opposed to them and pursued it to Argos. Returning from the pursuit, they found their main body defeated; and hard pressed by the Acarnanians, with difficulty made good their passage to Olpae, suffering heavy loss on the way, as they dashed on without discipline or order, the Mantineans excepted, who kept their ranks best of any in the army during the retreat.