The Aetolians, to whom their Roman allies attached the chief importance, had, like the Macedonians, much to suffer from the war; especially after the petty king of the Athamanes had been gained by Philip, and the interior of Aetolia had thus been laid open to Macedonian incursions.

Many Aetolians too had their eyes gradually opened to the dishonourable and pernicious part which the Roman alliance condemned them to play; a cry of horror pervaded the whole Greek nation when the Aetolians in concert with the Romans sold whole bodies of Hellenic citizens, such as those of Anticyra, Oreus, Dyme, and Aegina, into slavery.

But the Aetolians were no longer free; they ran a great risk if of their own accord they concluded peace with Philip, and they found the Romans by no means disposed, especially after the favourable turn which matters were taking in Spain and in Italy, to desist from a war, which on their part was carried on with merely a few ships, and the burden and injury of which fell mainly on the Aetolians.

At length however the Aetolians resolved to listen to the mediating cities: and, notwithstanding the counter-efforts of the Romans, a peace was arranged in the winter of 548-9 between the Greek powers.

Aetolia had converted an over-powerful ally into a dangerous enemy; but the Roman senate, which just at that time was summoning all the resources of the exhausted state for the decisive expedition to Africa, did not deem it a fitting moment to resent the breach of the alliance.