Assembling in Doberus, they prepared for descending from the heights upon Lower Macedonia, where the dominions of Perdiccas lay; for the Lyncestae, Elimiots, and other tribes more inland, though Macedonians by blood, and allies and dependants of their kindred, still have their own separate governments. The country on the sea coast, now called Macedonia, was first acquired by Alexander, the father of Perdiccas, and his ancestors, originally Temenids from Argos. This was effected by the expulsion from Pieria of the Pierians, who afterwards inhabited Phagres and other places under Mount Pangaeus, beyond the Strymon (indeed the country between Pangaeus and the sea is still called the Pierian Gulf); of the Bottiaeans, at present neighbours of the Chalcidians, from Bottia, and by the acquisition in Paeonia of a narrow strip along the river Axius extending to Pella and the sea; the district of Mygdonia, between the Axius and the Strymon, being also added by the expulsion of the Edonians. From Eordia also were driven the Eordians, most of whom perished, though a few of them still live round Physca, and the Almopians from Almopia. These Macedonians also conquered places belonging to the other tribes, which are still theirs- Anthemus, Crestonia, Bisaltia, and much of Macedonia proper. The whole is now called Macedonia, and at the time of the invasion of Sitalces, Perdiccas, Alexander's son, was the reigning king.
These Macedonians, unable to take the field against so numerous an invader, shut themselves up in such strong places and fortresses as the country possessed. Of these there was no great number, most of those now found in the country having been erected subsequently by Archelaus, the son of Perdiccas, on his accession, who also cut straight roads, and otherwise put the kingdom on a better footing as regards horses, heavy infantry, and other war material than had been done by all the eight kings that preceded him. Advancing from Doberus, the Thracian host first invaded what had been once Philip's government, and took Idomene by assault, Gortynia, Atalanta, and some other places by negotiation, these last coming over for love of Philip's son, Amyntas, then with Sitalces. Laying siege to Europus, and failing to take it, he next advanced into the rest of Macedonia to the left of Pella and Cyrrhus, not proceeding beyond this into Bottiaea and Pieria, but staying to lay waste Mygdonia, Crestonia, and Anthemus.
The Macedonians never even thought of meeting him with infantry; but the Thracian host was, as opportunity offered, attacked by handfuls of their horse, which had been reinforced from their allies in the interior. Armed with cuirasses, and excellent horsemen, wherever these charged they overthrew all before them, but ran considerable risk in entangling themselves in the masses of the enemy, and so finally desisted from these efforts, deciding that they were not strong enough to venture against numbers so superior.