After defeating Persia in the year 334 BCE, Alexander of Macedon was irresistibly drawn towards the great Indian landmass. However, the Persians warned him the country was no easy target; that several famous conquerors had fallen at the gates of India.
The Persians told him how their greatest king, Cyrus, who had conquered much of the civilised world, had been killed in a battle with Indian soldiers exactly two centuries before Alexander.
And in an earlier antiquity, the Assyrian queen Semiramis, who had who crossed the Indus with 400,000 highly trained troops, escaped with just 20 troops, the rest being slaughtered by the Indians.
In his book, Foreign Influence on Ancient India, Krishna Chandra Sagar says 150 years before Alexander, Indian archers and cavalry formed a significant component of the Persian army and played a key role in subduing Thebes in central Greece.
Alexander, however, knew no fear. More than anything else, he wanted to invade India. It would prove to be a strategic blunder.