Agis and Cleomenes

Then he sent Tritymallus the Messenian once more to Aratus, proposing that Acrocorinthus should be garrisoned by Achaeans and Lacedaemonians together, and promising Aratus personally double the stipend which he was receiving from King Ptolemy.[*](Ptolemy III., surnamed Euergetes, king of Egypt 247-222 B.C. See the Aratus, xli. 3. ) Aratus, however, would not listen to the proposition, but sent his son to Antigonus along with the other hostages, and persuaded the Achaeans to vote the surrender of Acrocorinthus to Antigonus. Therefore Cleomenes invaded the territory of Sicyon and ravaged it, and accepted the property of Aratus when the Corinthians voted it to him as a gift.

When Antigonus with a large force was crossing the mountain-range of Geraneia, Cleomenes thought it more advisable to fortify thoroughly, not the Isthmus, but the Oneian range of hills, and to wear out the Macedonians by a war of posts and positions, rather than to engage in formal battle with their disciplined phalanx. He carried out this plan, and thereby threw Antigonus into straits.