Battle of the Hydaspes happened in -326.

It was the battle which was fought in Hydaspes (Jhelum) in 326 CE.

Porus, the ruler of punjab

The events of his supposed defeat of King Porus of Hydaspes at the Battle of the Hydaspes River are strange - it was a close battle, and after Alexander 'won', he inexplicably gave back to Porus his kingdom of Hydaspes, and also donated to Porus his astounded ally King Taxiles' kingdom of Taxila.

He then went on doing conquests for Porus to add to the latter's kingdom.

It sounds more like Hydaspes River was a stalemate at best, if not a defeat for Alexander, given Alexander's obsequious approach to his alleged victim, but of course his tame historians are not going to admit it. It will remain a mystery.

In Asia Minor.