Events in Thrace cause two of Philip’ of Macedon’s Greek allies, the cities of Perinthus (later called Heraclea, present-day Marmaraereglisi) and Byzantium, to review their position.

Consequently, Philip attacks Perinthus in 340 BCE.

Perinthus, which at this time seems to have been more important than Byzantium itself, is helped by Byzantium and other Greek communities, including Athens, and even by the Persian satraps (which represents the first collision between the two great powers, Macedon and Persia).

Despite all Philip's efforts (and artillery), Perinthus holds out.

He also switches his siege engines from Perinthus against Byzantium, to which Artaxerxes sends support also, but he makes no easy progress here either.

Athens having declared war on Macedon in 340, Phocion aids in the defense of Byzantium, but from about this time he regards the Macedonians as unstoppable and cultivates diplomatic relations with them in order to avoid outright conquest.

Artaxerxes, having rebuilt Persian power, combines forces with Phocion's Athenian forces at Byzantium in 340-339 to oust the Macedonians from Anatolia.

The declaration of war by Athens in 340 has enabled Philip to raise the two sieges without undue loss of face, though he has failed to establish a threat to the Athenian corn route to southern Russia.

It is possible that the reason for Philip's abandonment of at least the second of these sieges is not military (siege engines are now virtually irresistible when applied to their target over time) but political.

Philip's gaze is now fixed on Athens, the greater enemy and the greater prize.

Athens is to be intimidated now by invasion of its territory through central Greece, where the key position is held by Thebes, his ally hitherto, but of late a dissatisfied and recalcitrant one.

His services to it in the Sacred War have been more than offset by his new position as its successful rival for leadership in and through the Amphictyony, and his moves toward hegemony in Greece can be seen in Thebes as encroachments.

Philip, returning from his expedition against the Scythians, is refused passage through the territory of the Thracian Triballi people, now occupying the Haemus (Balkan) Range, unless they receive a share of his booty.

Philip forces a passage but is wounded in the hostilities.

The seventeen-year-old Alexander, left in charge of Macedonia in 340 during Philip's attack on Byzantium, meanwhile defeats the Maedi, a Thracian people of northern Macedonia.

Aeschines, by provoking the council of the Amphictyonic League in 339 to declare a sacred war against the petty city of Amphissa in Locris, gives Philip, its designated leader from the first, a pretext on which to enter central Greece as the champion of the Amphictyonic forces.

The Sacred War—the fourth initiated by the Amphictyonic League—has followed a sequence of events much like those that had led to the third: Phocian cultivation of sacred lands; punishment by fine; refusal to pay; and a declaration of war by the Amphictyonic League.

Philip enters Greece in November 339, hoping to rush the Thebans into honoring their alliance and letting him through into Attica.

The Carthaginians are alarmed by Timoleon's success and ship a large army to Lilybaeum.

According to Plutarch it numbered seventy thousand men and included siege engines and chariots with four horses each.

Their army is large enough to conquer Sicily in its entirety, even with the Greeks united under Timoleon.

When they receive news that their territory is being raided by Timoleon's mercenaries, they march against them immediately under the command of Hasdrubal and Hamilcar.

When the Syracusans hear about the coming of the huge Carthaginian army they are terrified; Timoleon can gather no more than three thousand of them to march against the Carthaginians.

While on the march, one thousand of Timoleon's four thousand mercenaries desert him and return to Syracuse.

He leads his army, now numbering five thousand foot and one thousand horse, on a march of eight days away from Syracuse towards the river Crimissus, where the Carthaginians are concentrating.

Diodorus Siculus reports a greater size of Timoleon's army, giving a number of twelve thousand men.

Timoleon is positioned on a hill with his army, overlooking a plain were the Carthaginian army is located, in early June 339 BCE.

The Crimissus river separates the two armies and covers the plain in a thick fog, making it impossible to see the Carthaginian camp.

However, the noise signals the Greeks that the Carthaginians are going to cross the river.

The sun has risen higher in the sky and dissipated the fog in the plain, making the Carthaginian troops visible.

The four-horse chariots are at the vanguard of the army.

Behind them is infantry, who the Greeks identify as Carthaginian citizens, and at the rear are the foreign troops.

Timoleon notices the army is separated by the river, giving him a good opportunity to attack.

He decides to send the cavalry ahead to prevent the Carthaginian citizen infantry from forming their phalanx.

Timoleon now commands his army to descend into the plain, assigning the other Sicilian Greeks and a few of his mercenaries to his wings.

He commands the center, which is composed of the Syracusans and his best mercenaries.

Seeing that his cavalry cannot attack the enemy infantry because of the chariots, he orders his cavalry to ride past the line of chariots to attack the infantry on the flank, then charges the enemy with the infantry.

The Carthaginian citizen infantry resists the Greeks sturdily however, thanks to their excellent armor and large shields.

Fortunately for the Greeks, a thunderstorm rises up behind them and starts a shower of hail and rain.

The storm hits the Greeks in the back and the Carthaginians in the face, putting the latter at a severe disadvantage: the water and mud makes them ineffective fighters because of their heavy armor.

To make things worse for the Carthaginians, the storm causes the Crimissus to overflow from its banks and many smaller streams to flow over the plain.

The Carthaginian army flees when the Greeks defeat the first rank of four hundred men.

Many of those who flee over the plain are overtaken by the Greeks and killed.

Some drown in the river when they meet the part of the Carthaginian army that still tries to cross the river.

Of the ten thousand casualties for the Carthaginian army, three thousand are Carthaginian citizens.

Carthage, having been used to employing Libyans, Numidians and Iberians for its armies, has never lost so many of its own citizens before because it At least five thousand prisoners are accounted for, and many more are hidden or stolen by the Greek soldiers.

As they strip the dead bodies of their armor and possessions, the Greeks acquire a great deal of gold and silver from the rich Carthaginian citizens.

After the Greek army captures the Carthaginian camp, so much effort is required to gather the spoils that it takes until the third day to erect a trophy on the site.

Diodorus Siculus, calling the Carthaginian citizen infantry as the Sacred Band of Carthage, puts their number at twenty-five hundred and states that they all fought to the death.

Of the other nationalities of the army, more than ten thousand have perished and fifteen thousand have been taken captive.

The Romans conquer Anzio, a town older than Rome situated on the Tyrrhenian Sea in Roma province of the Lazio (Latium) region in central Italy, around 339.

Roman general Publius Decius Mus wittingly sacrifices himself in a futile attack against the rebel Latin forces at the 339 Battle of Vesuvius in a storied incident that occurs in one of the first major battles of the so-called Latin War.

Consequently, his embattled co-general, Titus Manlius (later surnamed Imperiosus Torquatus), is able to safely withdraw with the bulk of the Roman army.

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