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Rh Athens, as has been said, was now particularly vulnerable in the Thracian Chersonese and the north of the Ægean. To these points the restless Philip directed his attention in 342-341 B.C. It could not be doubted that he was meditating the annexation of this important district, and the conquest of the Greek cities on the northern shores of the Propontis—Perinthus, Selymbria, and above all Byzantium. If he could achieve this, Athens would be completely paralysed. Her maritime supremacy would be at an end, and her supplies of corn would be cut off. She would cease to exist as a commercial power. Philip's designs on Athens in Thrace were not unlike those of Napoleon I. on England in his attacks on Egypt and Spain. It was argued in Parliament at the time, that in carrying on war with France in these countries, we were practically standing on our own defence. Demosthenes took the same line of argument against Philip. A force had been sent out from Athens to the Chersonese as an army of observation on Philip's movements. The general, Diopeithes, was an able, energetic man; and it is interesting to us to know that he was the father of the poet Menander. There were some disputes between the Athenian colonists and the Cardians to the north of the Chersonese. Philip seemed disposed to favour the latter, upon which Diopeithes at once retaliated by invading Macedonian territory. He gained some successes, and for a while even deprived Philip of some of his recent conquests. Considering that the peace of 346 B.C. was still in force, Athens may be said to have been put in the wrong by her over-zealous general, and