Third Sacred War
The Third Sacred War (356–346 BC) was fought between the forces of the Delphic Amphictyonic League, principally represented by Thebes, and latterly by Philip II of Macedon, and the Phocians. The war was caused by a large fine imposed in 357 BC on the Phocians by the Amphictyonic League (dominated at that moment by Thebes), for the offense of cultivating sacred land; refusing to pay, the Phocians instead seized the Temple of Apollo in Delphi, and used the accumulated treasures to fund large mercenary armies. Thus, although the Phocians suffered several major defeats, they were able to continue the war for many years, until eventually all parties were nearing exhaustion. Philip II used the distraction of the other states to increase his power in northern Greece, in the process becoming ruler of Thessaly. In the end, Philip's growing power, and the exhaustion of the other states, allowed him to impose a peaceful settlement of the war, marking a major step in the rise of Macedon to pre-eminence in Ancient Greece.
Third Sacred War
All of central and southern Greece was now at Philip's mercy, and the Athenians could not now save Phocis even if they abandoned the peace. However, the Athenians were still ignorant of this turn of events when Phocian ambassadors came to Athens to plead for military aid around 9 July. The Athenian council recommended that the peace be rejected, and Thermopylae be occupied in order to help save Phocis; since, as far at the Athenian embassy knew, Philip's troops were still in Pherae, there seemed to be ample time to occupy the pass. By 12 July the news that Philip was "in the gates" arrived in Athens; the Athenians then knew that the situation was hopeless, and instead of acting on the previous recommendation of the council, the Assembly instead passed a motion re-affirming the Peace of Philocrates.