Are certain historic battles just impossible in the RTW engine?

[Geoffrey S]

If he wasn't severely outnumbered he would never have applied the cowboy tactics that he did.

Why not?

Ancient writers may exaggerate, but they didn't just make stuff up (most at least).

Plenty of cases where they did, whether intentionally or not.

Either Darius' army was close to the reported numbers, or Alexanders army was smaller.

If Darius' army can't be smaller, why should Alexanders be?

I'm not willing to discard the legacy of the greatest general ever just because modern notions claim 'it couldn't be done'. We know next to nothing about the inner workings of the Persian Empire.

Is there an ostrich smiley here?