Greeks always fought outnumbered?

[Paralus]

However you know very well one that did much more with much less, he happens to be the most well known figure in human history. He used the 1/10th of their numbers, took him less than 10 years, not 400 years, to make an Empire and at the end a great % of his initial army men were still alive and kicking, this despite having given innumerable battles on the top of major pitched encounters facing massive armies. Well, this is the thing about "efficiency"

Alexander? Alexander had a very large army by the standards of the day. If we look at logistics realistically, it is quite obvious not a single ancient army in the field could have exceeded 70 thousand men at most. And 47 thousand was a massive army by ancient standards.

The 1/10th may readily be dismissed - if we are talking the "major" battles (Granikos, Issos and Gaugamela) - as the numbers are in the realm of fantasy. There is little chance that Darius debouched 600,000 men and supply animals via the Bache Pass to Issos. That said, Alexander's army was large in - a Greek sense. No Greek city state could muster such and few "leagues" also. That his Successors could field larger arrays is beyond doubt. Had the armies at Paraetecene and Gabiene been under the one commander there'd have been some 75,000 men under a single banner. At Raphia (217) Ptolemy marched with 75,000 men (Plb.5.79.1) and Antigononus Monphthalmos, in 306 (Diod. 20.73.2):

...advanced through Coelê Syria with more than eighty thousand foot soldiers, about eight thousand horsemen, and eighty-three elephants. Giving the fleet to Demetrius, he ordered him to follow along the coast in contact with the army as it advanced. In all there had been made ready a hundred and fifty warships and a hundred transports in which a large stock of ordnance was being conveyed.

This was about the largest force feasibly gathered and co-ordinated. At Ipsos (Plut. Demetr.28.3), in 301, Antigonus fielded 80,000 (infantry and cavalry) and the "coalition of latest convenience" 79,000 infantry and cavalry (plus the famous 400 elephants).