Plutarch, Pyrrhus
Bernadotte Perrin, Ed.

31. So Pyrrhus, after accomplishing as it were an expiation for his son and celebrating his obsequies with a brilliant contest, having also vented much of his grief in his fury against the enemy, led his army on towards Argos. And when he learned that Antigonus was already posted on the heights commanding the plain, he pitched his camp near Nauplia. On the following day he sent a herald to Antigonus, calling him a robber, and challenging him to come down into the plain and fight with him for the kingdom. [2] But Antigonus replied that in conducting a campaign he relied more upon opportunities than upon arms, and that many roads to death lay open to Pyrrhus if he was tired of life. And now to both kings came ambassadors from Argos, entreating them to go away and allow the city to be neutral, but well-disposed towards both. Antigonus, accordingly, consented, and gave his son to the Argives as a hostage; Pyrrhus also agreed to go away, but since he gave no pledge, he remained under suspicion.

[3] Moreover, Pyrrhus himself had a significant portent; for the heads of his sacrificed cattle, though they already lay apart from the bodies, were seen to put out their tongues and lick up their own gore. And besides this, in the city of Argos the priestess of Apollo Lyceius ran forth from the temple crying that she saw the city full of corpses and slaughter, and that the eagle which visited the scene of combat presently vanished away.