Even bigger map?!

[seienchin]

Huh, you talk about Alexander conquering the whole world if he had the time, but one of his last battles was against an Indian king at the Hydaspes river, which he won, but it pretty much all the other indian kings started to unite against the threat of Alex, so they were preparing an army of about 200-300,000 troops with hundreds, perhaps of elephants and chariots. Alex only had 15-20,000 troops, the same phalanx and medium cavalry as always. All the genius and tactics in the world could not have helped him defeat those armies. He could never have conquered all of india, not to mention China, with the piddly little army he had, no matter how experienced each one was. It was good that he turned around when he did, or he would be remembering for meeting a bad end with his army at the end of a very successful campaign.

Well... He did conquer the persian empire、which was bigger...

And by the way, if Alexander would have had the time, he would have assembled a huge armies composed of persians, baktrians, egyptians plus his greek and makedon soldiers. The diadochii wars showed the incredible manpower of his empire.