They were expelled from Umm Qasr by the Ottomans due to their predatory habits of preying on caravans in Basra and trading ships in Shatt al-Arab.
[5] The Al Jalahma tribe allied itself with the Wahhabis of Arabia, who assumed control over much of the territory encompassing the Persian Gulf.
In 1811, Said bin Sultan of Muscat capitalized on an opportunity to attack the Wahhabi garrisons in Bahrain and Zubarah and the Al Khalifas were returned to power.
[7] Even after its secession from Bani Utbah, the Al Jalahma clan is still widely regarded by many to be a part of the tribal confederation.
Members of the clan are scattered in all over the Arabian Peninsula, Most Al Jalahmas are found in Kuwait, Qatar, Ksa and Bahrain.