In 1919, Sheikh Salim Al-Mubarak Al-Sabah intended to build a commercial city in the south of Kuwait. This caused a diplomatic crisis with Najd, but Britain intervened, discouraging Sheikh Salim. In 1920, an attempt by the Ikhwan to build a stronghold in southern Kuwait led to the Battle of Hamdh. The Battle of Hamdh involved 2,000 Ikhwan fighters against 100 Kuwaiti cavalrymen and 200 Kuwaiti infantrymen. The battle lasted for six days and resulted in heavy but unknown casualties on both sides resulting in the victory of the Ikhwan forces and leading to the battle of Jahra around the Kuwait Red Fort. The Battle of Jahra happened as the result of the Battle of Hamdh. A force of three to four thousand Ikhwan, led by Faisal Al-Dawish, attacked the Red Fort at Al-Jahra, defended by fifteen hundred men. The fort was besieged and the Kuwaiti position precarious; had the fort fallen, Kuwait would likely have been incorporated into Ibn Saud's empire. The Ikhwan attack repulsed for the while, negotiations began between Salim and Al-Dawish; the latter threatened another attack if the Kuwaiti forces did not surrender. The local merchant class convinced Salim to call in help from British troops, who showed up with airplanes and three warships, ending the attacks. After the Battle of Jahra, Ibn Saud's warriors, the Ikhwan, demanded that Kuwait follows five rules: evict all the Shias, adopt the Ikhwan doctrine, label the Turks "heretics", abolish smoking, munkar and prostitution, and destroy the American missionary hospital.