A war between the Thebans and their neighbors, the Phocians, which broke out in 357 or 356 B. C., assumed great importance in Greek history and was called the Sacred War,—as two earlier contests, in which Delphi was concerned, had been likewise named. It is sometimes called the Ten Years Sacred War. Thebes, controlling the shadowy Amphictyonic Council, had brought a charge of sacrilege against the Phocians and procured a decree imposing upon them a heavy fine. The Phocians resisted the decree with unexpected energy, and, by a bold and sudden movement, gained possession of Delphi, where they destroyed the records of the Amphictyonic judgment against them. Having the vast accumulation of the sacred treasures of the Delphic temple in their hands, they did not scruple to appropriate them, and were able to maintain a powerful army of mercenaries, gathered from every part of Greece, with which they ravaged the territories of Bœotia and Locris, and acquired control of the pass of Thermopylæ. {1597} In the midst of their successes they were called upon for help by the tyrant of Pheræ in Thessaly, then being attacked by Philip of Macedon (B. C. 353). The Phocians opposed Philip with such success, at first, that he retreated from Thessaly; but it was only to recruit and reanimate his army. Returning presently he overthrew the Phocian army, with great slaughter—Onomarchus, its leader, being slain—and made himself master of all Thessaly. Both Athens and Sparta were now alarmed by this rapid advance into Central Greece of the conquering arms of the ambitious Macedonian, and both sent forces to the help of the Phocians. The former was so energetic that an army of 5,000 Athenian foot-soldiers and 400 horse reached Thermopylæ (May 352 B. C.) before Philip had been able to push forward from Thessaly. When he did advance, proclaiming his purpose to rescue the Delphian temple from sacrilegious robbers, he was repulsed at the pass and drew back. It was the beginning of the struggle for Greek independence against Macedonian energy and ambition. A few months later Demosthenes delivered the first of his immortal orations, called afterwards Philippics, in which he strove to keep the already languishing energy of the Athenians alive, in unfaltering resistance to the designs of Philip. For six years there was a state of war between Philip and the Athenians with their allies, but the conquests of the former in Thrace and the Chalcidian peninsula were steadily pressed. At length (B. C. 346) Athens was treacherously persuaded into a treaty of peace with Philip (the Peace of Philocrates) which excluded the Phocians from its terms. No sooner had he thus isolated the latter than he marched quickly to Thermopylæ, secured possession of the pass and declared himself the supporter of Thebes.