There were no hostilities with Athens yet, but Athens was threatened by the Macedonian party which Philip's gold created in Euboea. From 352 to 346 BC, Philip did not again travel south. He was active in completing the subjugation of the Balkan hill-country to the west and north, and in reducing the Greek cities of the coast as far as the Hebrus. To the chief of these coastal cities, Olynthus, Philip continued to profess friendship until its neighbouring cities were in his hands.