How powerful was ancient Greece?

Powerful enough to become the largest civilization in Europe and able to match the Achaemenid Empire, which was the dominant power of Middle East at its time. After Alexander the Great merged Greek states with Macedonian Empire, it managed to defeat Achaemenid and ruled large parts of Middle East.

Ever heard of Alexander the Great?

Powerful enough that it was able to one day become Modern Greece. Where are ya now ya stupid Roman Empire? Nowhere, that's where.

era mucho muchos guerreros