"Ali, son of Muhammad, son of Abdullah, son of Abu Saif, has related that the Khalif ‘Umar, son of Al Khattab appointed Usman, son of Abu-l Asi of the tribe of Sakif to Bahrain and Uman in the year 15 H. (636 A.D.) Usman sent his brother Hakam to Bahrain, and he himself went to Uman, and despatched an army to Tana [Thana]. When the army returned he wrote to the Khalif Umar to inform him of it. Umar wrote in, reply: “O brother of Sakif, thou has placed the worm in the wood but I swear by the God, that if our men had been killed I would taken (slain) an equal number from your tribe.” Hakam dispatched a force to Barauz [Broach]; he also sent to the bay of Debal his brother Mughira, who met and defeated the enemy."