Battle of the Hydaspes

King Porus, a formidable local ruler, awaited them with a massive army and a terrifying line of heavily armored war elephants.

The Battle of the Hydaspes was a brutal, chaotic, and incredibly costly engagement fought in the pouring rain.

The Macedonian horses were terrified by the sights, sounds, and smells of the elephants, forcing the infantry into a horrific close-quarters meat grinder.

Alexander ultimately secured a brilliant victory, but the toll was immense.

And then Alexander, while the Scythians are trying to take out the Macedonian cavalry, sends the rest of his army over, manages to envelop the Scythians and destroys them and manages to effect his crossing.

The next one would be the Battle of the Hydaspes in 326 BC, in which another contested river crossing in which Porus's army is on the other side, the eastern side.

Alexander has his army race up to the bank of the river.

Pretending to cross does this multiple times and puts the porous and the rest of the enemy into a sense, lulls them into a sense of security until he finally overnight decides to cross, makes the crossing without, I want to say without too much trouble.