 For instance, in 342 BC, when Philip campaigned against the Cassopaeans, they declared that Philip was campaigning against Ambracia, and an Athenian expedition was duly dispatched—but to Acarnania, not Ambracia.Philip however seems to have had no intention of attacking Ambracia, and the expedition thus achieved nothing.Finally, in 341 BC, matters began to come to a head.