Cleomenes, hearing this, said that he was unjustly dealt with; for they ought to have told him so plainly at first, and not now he was come even to their doors, show their jealousy and deny him admission. And writing a letter to the Achaeans about the same subject, the greatest part of which was an accusation of Aratus, while Aratus, on the other side, spoke violently against him to the assembly, he hastily dislodged, and sent a trumpeter to denounce war against the Achaeans, not to Argos, but to Aegium, as Aratus writes, that he might not give them notice enough to make provision for their defence. There had also been a movement among the Achaeans themselves, and the cities were eager for revolt; the common people expecting a division of the land, and a release from their debts, and the chief men being in many places ill-disposed to Aratus, and some of them angry and indignant with him for having brought the Macedonians into Peloponnesus. Encouraged by these misunderstandings, Cleomenes invaded Achaea, and first took Pellene by surprise, and beat out the Achaean garrison, and afterwards brought over Pheneus and Pentelleum to his side. Now the Achaeans, suspecting some treacherous designs at Corinth and Sicyon, sent their horse and mercenaries out of Argos, to have an eye upon those cities, and they themselves went to Argos to celebrate the Nemean games. Cleomenes, advertised of this march, and hoping, as it afterwards fell out, that upon an unexpected advance to the city, now busied in the solemnity of the games, and thronged with numerous spectators, he should raise a considerable terror and confusion amongst them by night, marched with his army to the walls, and taking the quarter of the town called Aspis, which lies above the theatre, well fortified, and hard to be approached, he so terrified them that none offered to resist, but they agreed to accept a garrison, to give twenty citizens for hostages, and to assist the Lacedaemonians, and that he should have the chief command.
This action considerably increased his reputation and his power; for the ancient Spartan kings, though they in many ways endeavoured to effect it, could never bring Argos to be permanently theirs. And Pyrrhus, the most experienced captain, though he entered the city by force, could not keep possession, but was slain himself, with a considerable part of his army. Therefore they admired the despatch and contrivance of Cleomenes; and those that before derided him, for imitating, as they said, Solon and Lycurgus, in releasing the people from their debts, and in equalizing the property of the citizens, were now fain to admit that this was the cause of the change in the Spartans. For before they were very low in the world, and so unable to secure their own, that the Aetolians, invading Laconia brought away fifty thousand slaves; so that one of the elder Spartans is reported to have said, that they had done Laconia a kindness by unburdening it;and yet a little while after, by merely recurring once again to their native customs, and re-entering the track of the ancient discipline, they were able to give, as though it had been under the eyes and conduct of Lycurgus himself, the most signal instances of courage and obedience, raising Sparta to her ancient place as the commanding state of Greece, and recovering all Peloponnesus.
When Argos was captured, and Cleonae and Phlius came over, as they did at once, to Cleomenes, Aratus was at Corinth, searching after some who were reported to favour the Spartan interest. The news, being brought to him, disturbed him very much; for he perceived the city inclining to Cleomenes, and willing to be rid of the Achaeans.
Therefore he summoned the citizens to meet in the Council Hall, and slipping away without being observed to the gate, he mounted his horse that had been brought for him thither, and fled to Sicyon. And the Corinthians made such haste to Cleomenes at Argos, that, as Aratus says, striving who should be first there, they spoiled all their horses; he adds that Cleomenes was very angry with the Corinthians for letting him escape; and that Megistonas came from Cleomenes to him, desiring him to deliver up the castle at Corinth, which was then garrisoned by the Achaeans, and offered him a considerable sum of money, and that he answered that matters were not now in his power, but he in theirs. Thus Aratus himself writes. But Cleomenes, marching from Argos, and taking in the Troezenians, Epidaurians, and Hermioneans, came to Corinth, and blocked up the castle, which the Achaeans would not surrender; and sending for Aratus's friends and stewards, committed his house and estate to their care and management;and sent Tritymallus, the Messenian, to him a second time, desiring that the castle might be equally garrisoned by the Spartans and Achaeans, and promising to Aratus himself double the pension that he received from King Ptolemy. But Aratus, refusing the conditions, and sending his own son with the other hostages to Antigonus, and persuading the Achaeans to make a decree for delivering the castle into Antigonus's hands, upon this Cleomenes invaded the territory of the Sicyonians, and by a decree of the Corinthians, accepted Aratus's estate as a gift.