oration, On the Navy, in which he espoused moderation and proposed the reform of the symmoriai (boards) as a source of funding for the Athenian fleet. In 352 BC, he delivered For the Megalopolitans and, in 351 BC, On the Liberty of the Rhodians. In both speeches he opposed Eubulus, the most powerful Athenian statesman of the period 355 to 342 BC. The latter was no pacifist but came to eschew a policy of aggressive interventionism in the internal affairs of the other Greek cities. Contrary to Eubulus' policy, Demosthenes called for an alliance with Megalopolis against Sparta or Thebes, and for supporting the democratic faction of the Rhodians in their internal strife. His arguments revealed his desire to articulate Athens' needs and interests through a more activist foreign policy, wherever opportunity might provide. Although his early orations were unsuccessful and reveal a lack of real conviction and of coherent strategic and political prioritisation, Demosthenes established himself as an important political personality and broke with Eubulus' faction, of which a prominent member was Aeschines. He thus laid the foundations for his future political successes and for becoming the leader of his own "party" (the issue of whether the modern concept of political parties can be applied in the Athenian democracy is hotly disputed among modern scholars). Confrontation with Philip II First Philippic and the Olynthiacs (351–349 BC) Most of Demosthenes' major orations were directed against the growing power of King Philip II of Macedon. Since 357 BC, when Philip seized Amphipolis and Pydna, Athens had been formally at war with the Macedonians. In 352 BC, Demosthenes characterised Philip as the very worst enemy of his city; his speech presaged the fierce attacks that Demosthenes would launch against the Macedonian king over the ensuing years. A year later he criticised those dismissing Philip as a person of no account and warned that he was as dangerous as the king of Persia. In 352 BC, Athenian troops successfully opposed Philip at Thermopylae, but the Macedonian victory over the Phocians at the Battle of Crocus Field shook Demosthenes. In 351 BC, Demosthenes felt strong enough to express his view concerning the most important foreign policy issue facing Athens at that time: the stance his city should take towards Philip. According to Jacqueline de Romilly, a French philologist and member of the Académie française, the threat of Philip would give Demosthenes' stances a focus