War elephants were used in Iranian military history, most notably in Achaemenid, Seleucid and Sasanian periods. The elephants were Asian elephants, and were recruited from South Asian provinces of Persia, but also possibly Western Asiatic elephants from mainland Iran.
The elephants were hired as mercenary troops with their riders. They came from Indian territories under Persian rule. Some historians say that some were from Iran. They were called the Syrian elephant but this may be incorrect.
Persian war elephants were trained by their rider, called a mahout, who would also ride the elephant into battle. The mahouts were of Indian origin, and so were the archers. Training elephants was a difficult task and they would be hard to maintain because they ate so much food and water. On the march, huge paths needed to be cut for the elephants. Many were kept in the shah's menagerie the most famous of which was Khosrau II where he kept a "thousand white elephants."
Persian elephants were from Indian origin and were probably armed with Indian styled weapons. The men(excluding the driver) sat in a large tower from which troops would fight. The elephant itself would normally be armed with thin plate armour (the Sassanids used chain mail as well as thin plate armour)and would bear a large crenelated wooden howdah on its back. The troops would be armed with bow and arrows and javelin. The sworn enemy of the Sassanids, the Eastern Roman empire, were terrified by the huge beasts, making them very effective in battle. When they were used at the Battle of al-Q?disiyyah, they came to be known as "double edged weapons". King ( shah ) Yazdgerd III attempted to use war elephants to fight off Arab invaders, however his elephants got sand in their eyes and panicked. They turned around and ran amok, killing their own troops.
Persians used war elephants at the Battle of Gaugamela in 331 BC. The battle raged between king Alexander the Great of Macedon and king Darius III of Persia. The Persians had 15 Indian-trained war elephants, which were placed at the centre of the Persian line, and they made such an impression on the Macedonian troops that Alexander felt the need to sacrifice to the God of Fear the night before the battle. Despite this the Persians lost the battle, relinquishing the Achaemenid empire to Alexander.
Some claim that they had been used previously in the Greek campaign of King Xerxes I of Persia, and even further back at the time of Darius the Great at the Indus, the Danube and against the Scythians in 512 BC. Neither Xenophon nor Herodotus mention war elephants in their accounts of these earlier campaigns.
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In early Sasanian period, the war elephants were used in battles as a psychological weapon for its terrorizing effects. Later this role evolved into a logistical one, and in late Sasanian period they were used by army commanders to survey the battle scene.
Sasanian elephants were under a special chief, known as the Zend-hapet, or "Commander of the Indians", as they were from India.
... the elephants, looking like walking hills, ... by the movements of their enormous bodies, they threatened destruction to all who came near them, dreaded as they were from past experience.
In the Battle of the Bridge near the fall of the Sasanian Empire, the Sasanians under Bahman Jaduyah used their elite Zhayedan forces, which included war elephants, against the invading Arab Muslims under Abu Ubaid al-Thaqafi. A white elephant tore the latter from his horse with its trunk, and trampled him under foot. The Arab Muslims suffered heavy casualties in the battle. The elephants was also used in the Battle of al-Q?disiyyah, but was unsuccessful.