Passing through Bœotia, he undertook the task of restoring the city of Thebes, which had been destroyed twenty years previously by Alexander the Great, and had ever since existed only as a military post on the ancient citadel called Cadmea. The other Bœotian towns, to whom the old Theban territory had been assigned, were persuaded or constrained to relinquish it; and Cassander invited from all parts of Greece the Theban exiles or their descendants. From sympathy with these exiles, and also with the ancient celebrity of the city, many Greeks, even from Italy and Sicily, contributed to the restoration. The Athenians, now administered by Demetrius Phalereus under Cassander’s supremacy, were particularly forward in the work; the Messenians and Megalopolitans, whose ancestors had owed so much to the Theban Epaminondas, lent strenuous aid. Thebes was re-established in the original area which it had occupied before Alexander’s siege; and was held by a Cassandrian garrison in the Cadmea, destined for the mastery of Bœotia and Greece.
After some stay at Thebes, Cassander advanced towards Peloponnesus. Alexander (son of Polysperchon) having fortified the isthmus, he was forced to embark his troops with his elephants at Megara, and cross over the Saronic Gulf to Epidaurus. He dispossessed Alexander of Argos, of Messenia, and even of his position on the isthmus, where he left a powerful detachment, and then returned to Macedonia. His increasing power raised both apprehension and hatred in the bosom of Antigonus, who endeavoured to come to terms with him, but in vain. Cassander preferred the alliance with Ptolemy, Seleucus, and Lysimachus—against Antigonus, who was now master of nearly the whole of Asia, inspiring common dread to all of them. Accordingly, from Asia to Peloponnesus, with arms and money Antigonus despatched the Milesian Aristodemus to strengthen Alexander against Cassander; whom he further denounced as an enemy of the Macedonian name, because he had slain Olympias, imprisoned the other members of the regal family, and re-established the Olynthian exiles. He caused the absent Cassander to be condemned by what was called a Macedonian assembly, upon these and other charges.
Antigonus further proclaimed, by the voice of this assembly, that all the Greeks should be free, self-governing, and exempt from garrisons or military occupation. It was expected that these brilliant promises would enlist partisans in Greece against Cassander; accordingly Ptolemy, ruler of Egypt, one of the enemies of Antigonus, thought fit to issue similar proclamations a few months afterwards, tendering to the Greeks the same boon from himself. These promises, neither executed nor intended to be executed, by either of the kings, appear to have produced little or no effect upon the Greeks.
[315-312 B.C.]
The arrival of Aristodemus in Peloponnesus had reanimated the party of Alexander (son of Polysperchon), against whom Cassander was again obliged to bring his full forces from Macedonia. Though successful against Alexander at Argos, Orchomenos, and other places, Cassander was not able to crush him, and presently thought it prudent to gain him over. He offered to him the separate government of Peloponnesus, though in subordination to himself; Alexander accepted the offer—becoming Cassander’s ally—and carried on war, jointly with him, against Aristodemus, with varying success, until he was presently assassinated by some private enemies. Nevertheless his widow Cratesipolis, a woman of courage and energy, still maintained herself in considerable force at Sicyon.
Cassander’s most obstinate enemies were the Ætolians, of whom we now first hear formal mention as a substantive confederacy. These Ætolians became the allies of Antigonus as they had been before of Polysperchon, extending their predatory ravages even as far as Attica. Protected against foreign garrisons, partly by their rude and fierce habits, partly by their mountainous territory, they were almost the only Greeks who could still be called free. Cassander tried to keep them in check through their neighbours the Acarnanians, whom he induced to adopt a more concentrated habit of residence, consolidating their numerous petty townships into a few considerable towns,—Stratus, Sauria, and Agrinium,—convenient posts for Macedonian garrisons. He also made himself master of Leucas, Apollonia, and Epidamnus, defeating the Illyrian king Glaucias, so that his dominion now extended across from the Thermaic to the Adriatic Gulf. His general Philippus gained two important victories over the Ætolians and Epirots, forcing the former to relinquish some of their most accessible towns.