16 events the sources record for this year, grouped by region.
What happened
West Asia (6)
Having crossed the river Nessos, on the tenth day he reached Mount Haemus, where he held off the Thracians who were rolling wagons down the slope, using a shield formation, and drove them off; about 1,500 were killed. (Arrian, Anabasis of Alexander 1.1.1–1.1.5)
Crossing Haemus, he surprised the Triballi camped on the river Lyginus in Triballian territory and killed three thousand. (Arrian, Anabasis of Alexander 1.2.1–1.2.7)
Three days after the battle he reached the Ister river and tried to land on the island where the Triballi had taken refuge, using ships from Byzantium, but failed. (Arrian, Anabasis of Alexander 1.3.1–1.3.6)
At night he crossed the river with 1,500 cavalry and 4,000 infantry, drove the Getae out of the grain fields, razed their city, and offered sacrifices. (Arrian, Anabasis of Alexander 1.4.1–1.4.3)
Syrmus, king of the Triballi, and envoys of the Celts came and asked for friendship, and an alliance was made. The Celts answered that they feared the sky would fall on them. (Arrian, Anabasis of Alexander 1.4.1–1.4.6)
As spring approached, he set out from Amphipolis and marched toward Thrace by way of the Triballi and Illyria, entering the land of the independent Thracians. (Arrian, Anabasis of Alexander 1.1.1–1.1.5)
Passing through Agrianes and Paeonia, he reached Pelion, which Clitus had taken, and camped beside the river Eordaicus. The next day Glaucias, king of the Taulantians, joined him with a great army. (Arrian, Anabasis of Alexander 1.5)
By maneuvering the phalanx he drove the enemy off the mountain and withdrew after crossing the river; three days later he attacked the undefended enemy camp by night and defeated it heavily. Clitus set fire to the city and fled to Glaucias. (Arrian, Anabasis of Alexander 1.6.1–1.6.8)
Exiles from Thebes killed two officers of the garrison in the Cadmea and rebelled; Alexander came down from northern Macedonia into Boeotia and camped at Iolaos near the olive grove. (Arrian, Anabasis of Alexander 1.7.1–1.7.5)
Perdiccas, without orders, drew up his palisade and went in, starting the battle; Alexander drove the Theban army back to the city gates in phalanx formation, and the Macedonian army entered the city with them. (Arrian, Anabasis of Alexander 1.8.1–1.8.8)
The disposition of Thebes was left to the allies: a garrison was placed in the Cadmea, the city was razed, and women, children and surviving men were sold into slavery. The house and descendants of Pindar were spared. (Arrian, Anabasis of Alexander 1.9.1–1.9.9)
When Athens sent envoys, Alexander demanded the surrender of Demosthenes and others, then withdrew the demand and banished only Charidemus, who fled to Darius. (Arrian, Anabasis of Alexander 1.10.1–1.10.4)