In the first Muslim civil war, the Tayy under Adi were strong supporters of Ali against the Umayyads. They fought alongside him at the Battle of the Camel and the Battle of Siffin in 656 and 657, respectively. During the latter battle, a chief of the tribe, Sa'id ibn Ubayd at-Ta'i, was slain. Unlike the Tayy of Arabia, the Tayy in Syria led by Habis ibn Sa'd at-Ta'i aligned with the Umayyads, who assigned Habis as the commander of Jund Hims. In a confrontation between the two sides in Iraq, Habis was killed. Habis was the maternal uncle of Adi's son, Zayd, and the latter was angered by his slaying, prompting him to seek out and kill the Ali loyalist, a member of the Banu Bakr, responsible for Habis's death. Zayd's act was sharply condemned by Adi who threatened to hand him over to Ali, prompting Zayd to defect to the Umayyads. Afterward, Adi smoothed over the consequent tension with Ali's camp by reaffirming his loyalty. The Umayyads ultimately triumphed and established a caliphate that had reached the Indian Subcontinent by the early 8th century. A Tayyid commander named al-Qasim ibn Tha'laba ibn Abdullah ibn Hasn played an instrumental role in the Umayyad conquest of Sindh in 712 by killing the country's Hindu king Raja Dahir in battle.