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The Siamese Unique Unit, it has no defensive bonuses, but can move after attacking and gets a bonus vs Mounted (+50%). Replaces the Knight. Like the indian War Elephant, it does not need any special resources (horses) even though the knight, which it replaces, does.
These elephants are strong versus knights and other mounted units, however they are weak to Ranged attacks (Crossbowman, Keshik, Longbowman, Camel Archer) and they tend to be severely damaged by powerful siege units (Trebuchet, Cannon) used to defend cities.
The safest way to attack these units is to use Ranged attacks from Crossbowmen or other units with a strong Ranged attack, and then finish them off with Pikemen. They are classified as "Mounted" so Pikemen enjoy a 100% bonus when fighting these units.
In Southeast Asia elephants continued to be employed in warfare far into the Middle Ages. In Siam, particularly, war elephants were highly prized, and leaders often fought from atop them. In 1593 a war between Burma and Siam ended in a Siamese victory when Siamese King Naresuan killed Burmese crown prince Minchit Sra in single combat atop elephants.
Naret, along with other captive princes from other kingdoms, were educated in martial arts and war strategy of Burmese and Portuguese style. He was later noted for his new tactics that enabled him to gain victory over the Burmese. Naret then found himself under competition with Bayinnaung's grandson (Nanda Bayin's son) Mingyi Swa.Template:Citation needed
In 1569, Bayinnaung was able to take Ayutthaya and installed Maha Thammarachathirat as the King of Ayutthaya. After seven years of captivity, Prince Naret, along with his brother the White Prince, was released to Ayutthaya in exchange for his sister Supankanlaya as Bayinnuang's concubine
Credit (wikipedia king naresuan)