Apadana Palace , suggesting that he was carrying some of the gold dust paid by the Indians as tribute to the Achaemenid court. According to the Naqsh-e Rustam inscription of
Darius I (circa 490 BCE), there were three Achaemenid Satrapies in the subcontinent: Sattagydia, Gandara, Hidūš.
Tribute payments , in the Achaemenid Empire, according to
Herodotus The Province of
Indos (
Ἰνδός, the
Indus valley) formed the 20th Province, and was the richest and most populous of the Achaemenid Provinces. According to Herodotus, the "Indians" ('Ινδοι,
Indoi)), as separate from the Gandarei and the Sattagydians, formed the 20th taxation Province, and were required to supply gold dust in tribute to the Achaemenid central government for an amount of 360 Euboean
talents (equivalent to about 8300 kg or 8.3 tons of gold annually, a volume of gold that would fit in a cube of side 75 cm). supporting the throne of
Xerxes I on his tomb at Naqsh-e Rostam. In the spring of 480 BCE "Indian troops marched with Xerxes's army across the
Hellespont".
hoplite (
Vix crater, c. 500 BCE), and a
Hindush warrior of the
Achaemenid army (tomb of
Xerxes I, c. 480 BCE), at the time of the
Second Persian invasion of Greece (480–479 BCE) Herodotus also explains that the Indian cavalry under the Achaemenids had an equipment similar to that of their foot soldiers: The Gandharis had a different equipment, akin to that of the Bactrians:
Destruction of Athens and Battle of Plataea (479 BCE) After the first part of the campaign directly under the orders Xerxes I, the Indian troops are reported to have stayed in Greece as one of the 5 main nations among the 300,000 elite troops of General
Mardonius. They fought in the last stages of the war, took part in the
Destruction of Athens, but were finally vanquished at the
Battle of Plataea: , 479 BCE At the final
Battle of Plataea in 479 BCE, Indians formed one of the main corps of Achaemenid troops (one of "the greatest of the nations"). They were one of the main battle corps, positioned near the center of the Achaemenid battle line, between the
Bactrians and the
Sakae, facing against the enemy Greek troops of "
Hermione and
Eretria and
Styra and
Chalcis". and is nowadays estimated to around 20,000. Indians also supplied part of the cavalry, the total of which was about 5,000. The soldiers from India are characterized by their particular clothing, only composed of a loin cloth and sandals, with bare upper body, in contrast to all the other ethnicities of the Achaemenid army, who are fully clothed, and in contrast also to the neighbouring provinces of
Bactria or
Arachosia, who are also fully clothed. (who died in 338 BCE). The presence of the three ethnicities of Indian soldiers on all the tombs of the Achaemenid rulers after
Darius, except for the last ruler
Darius III who was vanquished by Alexander at
Gaugamela, suggests that the Indians were under Achaemenid dominion at least until 338 BCE, the date of the end of the reign of
Artaxerxes III, before the accession of Darius III, that is, less than 10 years before the campaigns of Alexander in the East and his victory at Gaugamela.
Indians at the Battle of Gaugamela (331 BCE) According to
Arrian, Indian troops were still deployed under Darius III at the
Battle of Gaugamela (331 BCE). He explains that Darius III "obtained the help of those Indians who bordered on the Bactrians, together with the Bactrians and Sogdianians themselves, all under the command of Bessus, the Satrap of Bactria". The Indians in questions were probably from the area of Gandara. Indian "hill-men" are also said by Arrian to have joined the
Arachotians under Satrap Barsentes, and are thought to have been either the Sattagydians or the Hindush. Fifteen Indian war elephants were also part of the army of Darius III at Gaugamela. Still, it seems they did not participate to the final battle, probably because of fatigue. This was a relief for the armies of Alexander, who had no previous experience of combat against war elephants. The elephants were captured with the baggage train by the Greeks after the engagement. Xerxes detail Gandharan enhanced.jpg|Gandaran soldier of the Achaemenid army, c. 480 BCE.
Xerxes I tomb. Xerxes detail Gandharan head enhanced.jpg|Gandaran soldier (enhanced detail) Xerxes detail Sattagydian.jpg||alt=Sattagydian soldier of the Achaemenid army, circa 480 BCE. Xerxes I tomb. Xerxes detail Sattagydian head enhanced.jpg|Sattagydian soldier (enhanced detail) Xerxes_Hidush_warrior_480_BCE.jpg|Hindush soldier of the Achaemenid army, c. 480 BCE.
Xerxes I tomb. Xerxes detail Hidush head enhanced.jpg|Hindush soldier (enhanced detail) ==Greek and Achaemenid coinage==