Greek/Roman cavalry

[Kraxis]

The only time that Alexander failed to plan for such contingencies was upon his return from India through the Gedrosian desert. He almost lost his entire army there.

He lost most of the army he had taken with him, but he had sent about half around the other way, prior to his march to the sea.

Also, it is being speculated that the slightly nuts Alexander actually punished his army for their 'disloyalty' in not following him where he wanted to go. The army he took through Gedrosia were the Macedonians, while the 'spared' part was mainly the eastern troops.