13 events the sources record for this year, grouped by region.
What happened
China (1)
Qin attacked Wei, crossed the Yellow River, took Fenyin and Pishi, and captured Jiao. (Zizhi Tongjian (Comprehensive Mirror) 資治通鑑 卷002 (원문 단락 #176, -329년))
Central Asia (5)
He passed through Drapsaca and in the first assault captured Bactra and Aornos, and made Artabazus satrap of Bactria. Bessus crossed the Oxus, burned the boats, and withdrew into Sogdiana. (Arrian, Anabasis of Alexander 3.28.9–3.29.1)
Alexander reached Maracanda, the Sogdian capital, and marched toward Tanais (Jaxartes). The Macedonians who were plundering were massacred, and about 30,000 fled to a high rocky mountain; Alexander took it despite being hit by an arrow that broke his shinbone. (Arrian, Anabasis of Alexander 3.30.1–3.30.6)
Alexander entered the city secretly with picked troops through a dry river channel, opened the gates, and was wounded on the head and neck by a stone. In the first capture about 8,000 fighters were killed, and of the 15,000 who had gathered, the rest surrendered when they ran out of water. The seventh city also fell. (Arrian, Anabasis of Alexander 4.3)
After twenty days he fortified a new city, Alexandria Eschate, settling mercenaries and Macedonian veterans there, and held games. The Scythians across the river insulted him; he crossed on skins and, supported by missile fire, defeated the Scythian cavalry, killing about 1,000 and taking 150 prisoners. Alexander collapsed from drinking water and diarrhea. (Arrian, Anabasis of Alexander 4.4.1–4.4.9)
When Alexander heard, he reached Maracanda in three days over 1,500 stadia with half his companion cavalry. Spitamenes abandoned the city and was driven into the desert. Alexander buried the dead and laid waste the land. (Arrian, Anabasis of Alexander 4.6.1–4.6.3)
West Asia (6)
He subdued Arachosia, Drangiana, and others, crossed the Caucasus on snowy roads, founded Alexandria there and sacrificed, then crossed the Caucasus. Satibarzanes, who had rebelled in Areia, was killed by a spear in battle with Erigyios. (Arrian, Anabasis of Alexander 3.28.1–3.28.4)
They filled leather bags with chaff and crossed the Oxus over five days. When Spitamenes and Datafernes offered to hand over Bessus, Alexander sent Ptolemy and covered a ten-day road in four days. (Arrian, Anabasis of Alexander 3.29.1–3.29.7)
Ptolemy surrounded the village and received Bessus. Alexander had him placed in a neck stock by the roadside as he passed. He questioned and whipped him, then sent him to Bactria to be executed. (Arrian, Anabasis of Alexander 3.30.1–3.30.11)
Alexander attacked the first city with ladders and took it, then took the second the same day and the third the next day. He used cavalry to watch the other two and cut down fugitives, and in two days made five cities into slaves. Craterus besieged the large city of Kyropolis. (Arrian, Anabasis of Alexander 4.2.1–4.2.2)
An embassy of the Scythian king offered apples. Meanwhile Spitamenes lifted his siege of Marakanda's citadel and fled, and Pharnuches and his group pursued him; at the Polytimetos river, amid confused command, they were surrounded and wiped out on an island. (Arrian, Anabasis of Alexander 4.5.1–4.5.6)
Traditions differ on whether Privernum fell by assault and Vitruvius was captured, or whether he surrendered with the herald's staff in hand (Livy, History of Rome (Ab Urbe Condita) 8.20)