18 events the sources record for this year, grouped by region.
What happened
South Asia (5)
Peithon brought in the rebel Musicanus, and Alexander left after either tearing down his city or stationing garrisons there, and went on to Patala. (Arrian, Anabasis of Alexander 6.17.1–6.17.2)
He returned to Patala, entrusted Hephaestion with fortifying the citadel and building a shipyard, and then explored the sea by another mouth of the river. (Arrian, Anabasis of Alexander 6.20.1–6.20.5)
Upon the teaching of the novice Nigrodha, Asoka took refuge in the Dhamma and offered a feast to 60,000 monks. (Mahavamsa (Great Chronicle of Sri Lanka) 5.37-72)tradition
To prevent rebellion, Alexander went down the Hydraotes by boat. In the camp where the Hydraotes and Akesines met, Hephaestion commanded the army and Nearchus the fleet, and it is said the men raised their hands in greeting. (Arrian, Anabasis of Alexander 6.13.1–6.13.5)
The surviving Mallians and Oxydracians sent envoys with gifts asking to submit. (Arrian, Anabasis of Alexander 6.14.1–6.14.5)
At the confluence of the Akesines and Indus he waited for Perdiccas's army, obtained new ships, and received envoys from the Ossadioi. (Arrian, Anabasis of Alexander 6.15.1–6.15.7)
Since Oxycanus did not come to surrender, Alexander stormed and took the two largest cities, capturing him in the second city. (Arrian, Anabasis of Alexander 6.16)
Going down the Indus he experienced tides for the first time; the ships ran aground on dry ground and then floated up again, which amazed him. (Arrian, Anabasis of Alexander 6.19.1–6.19.5)
Monsoon winds blocked the sea route, so he marched by land toward the Oritae to subdue them. (Arrian, Anabasis of Alexander 6.21.1–6.21.3)
At a narrow pass on the border of Gedrosia and the Oritae, most of the enemy fled as Alexander approached. (Arrian, Anabasis of Alexander 6.22)
The Gedrosian route had no water or supplies, and the army marched mostly at night. Alexander wanted to examine the coastal harbors and have wells dug. (Arrian, Anabasis of Alexander 6.23)
About sixty days after leaving Ora, he reached Pura, the capital of Gedrosia. The sources describe this as the greatest hardship he suffered in Asia. (Arrian, Anabasis of Alexander 6.24.1–6.24.6)
On the march, thirsty, Alexander poured out in front of everyone the water a soldier had brought him in his helmet. (Arrian, Anabasis of Alexander 6.26.1–6.26.5)