In 1783, Al-Madhkur lost the islands of Bahrain following his defeat by the Bani Utbah tribe at the 1782 Battle of Zubarah. Bahrain was not new territory to the Bani Utbah; they had been a presence there since the 17th century. During that time, they started purchasing date palm gardens in Bahrain; a document shows that 81 years before arrival of the Al Khalifa, one of the sheikhs of the Al Bin Ali tribe (an offshoot of the Bani Utbah) had bought a palm garden from Mariam bint Ahmed Al Sanadi in Sitra island.