In memory of Berenice and Ptolemy he named his son by Antigone, Ptolemy, and having built a city in the peninsula of Epirus, called it Berenicis. From this time he began to revolve many and vast projects in his thoughts; but his first special hope and design lay near home, and he found means to engage himself in the Macedonian affairs under the following pretext. Of Cassander's sons, Antipater, the eldest, killed Thessalonica, his mother, and expelled his brother Alexander, who sent to Demetrius entreating his assistance, and also called in Pyrrhus; but Demetrius being retarded by multitude of business, Pyrrhus, coming first, demanded in reward of his service the districts called Tymphaea and Parauaea in Macedon itself and of their new conquests, Ambracia, Acarnania, and Amphilochia. The young prince giving way, he took possession of these countries, and secured them with good garrisons, and proceeded to reduce for Alexander himself other parts of the kingdom which he gained from Antipater. Lysimachus, designing to send aid to Antipater, was involved in much other business, but knowing Pyrrhus would not disoblige Ptolemy, or deny him anything, sent pretended letters to him as from Ptolemy, desiring him to give up his expedition, upon the payment of three hundred talents to him by Antipater. Pyrrhus, opening the letter, quickly discovered the fraud of Lysimachus; for it had not the accustomed style of salutation, "The father to the son, health,"but "King Ptolemy to Pyrrhus, the king, health;" and reproaching Lysimachus, he notwithstanding made a peace, and they all met to confirm it by a solemn oath upon sacrifice. A goat, a bull, and a ram being brought out, the ram on a sudden fell dead. The others laughed, but Theodotus the prophet forbade Pyrrhus to swear, declaring that Heaven by that portended the death of one of the three kings, upon which he refused to ratify the peace.
The affairs of Alexander being now in some kind of settlement, Demetrius arrived, contrary, as soon appeared, to the desire and indeed not without the alarm of Alexander. After they had been a few days together, their mutual jealousy led them to conspire against each other; and Demetrius, taking advantage of the first occasion, was beforehand with the young king, and slew him, and proclaimed himself King of Macedon. There had been formerly no very good understanding between him and Pyrrhus; for besides the inroads he made into Thessaly, the innate disease of princes, ambition of greater empire, had rendered them formidable and suspected neighbours to each other, especially since Deidamia's death; and both having seized Macedon, they came into conflict for the same object, and the difference between them had the stronger motives. Demetrius having first attacked the Aetolians and subdued them, left Pantauchus there with a considerable army, and marched direct against Pyrrhus, and Pyrrhus, as he thought, against him; but by mistake of the ways they passed by one another, and Demetrius falling into Epirus wasted the country, and Pyrrhus, meeting with Pantauchus, prepared for an engagement. The soldiers fell to, and there was a sharp and terrible conflict, especially where the generals were. Pantauchus, in courage, dexterity, and strength of body, being confessedly the best of all Demetrius's captains, and having both resolution and high spirit, challenged Pyrrhus to fight hand to hand; on the other side Pyrrhus, professing not to yield to any king in valour and glory, and esteeming the fame of Achilles more truly to belong to him for his courage than for his blood, advanced against Pantauchus through the front of the army.
First they used their lances, then came to a close fight, and managed their swords both with art and force; Pyrrhus receiving one wound, but returning two for it, one in the thigh and the other near the neck repulsed and overthrew Pantauchus, but did not kill him outright, as he was rescued by his friends. But the Epirots exulting in the victory of their king, and admiring his courage, forced through and cut in pieces the phalanx of the Macedonians, and pursuing those that fled, killed many, and took five thousand prisoners.
This fight did not so much exasperate the Macedonians with anger for their loss, or with hatred to Pyrrhus, as it caused esteem and admiration of his valour, and great discourse of him among those that saw what he did, and were engaged against him in the action. They thought his countenance, his swiftness, and his motions expressed those of the great Alexander, and that they beheld here an image and resemblance of his rapidity and strength in fight; other kings merely by their purple and their guards, by the formal bending of their necks and lofty tone of their speech, Pyrrhus only by arms and in action, represented Alexander. Of his knowledge of military tactics and the art of a general, and his great ability that way, we have the best information from the commentaries he left behind him.
Antigonus, also, we are told, being asked who was the greatest soldier, said, "Pyrrhus, if he lives to be old," referring only to those of his own time; but Hannibal of all great commanders esteemed Pyrrhus for skill and conduct the first, Scipio the second, and himself the third, as is related in the life of Scipio. In a word, he seemed ever to make this all his thought and philosophy, as the most kingly part of learning: other curiosities he held in no account.