List the reasons that determined the victory of the Greeks in the Greco-Persian wars.

The following reasons can be distinguished for the victory of the Greeks over the troops of the Persians:

The Greeks were commanded by good generals;
The Greeks fought bravely and staunchly for their land;
The Greeks fought of their own free will, and the Persian troops came here as conquerors (the Persian army consisted of different peoples who spoke different languages, and therefore, discipline in the army was maintained with the help of tough measures).