As these campaigns progressed, Damocritus, the strategos of the Aetolian League, had decided that it was time to join the war on the Roman side. Together with King Amynander, he led an invasion of Magnesia and Perrhaebia, then continued to ravage Thessaly. There, Philip suddenly appeared and completely defeated their force. He spent some time besieging the Aetolian city of Thaumaci, but gave up and withdrew as winter approached. He spent the winter training his army and engaging in diplomacy, particularly with the Achaean League.