The Ikhwan Revolt began in 1927, when the tribesmen of the Mutayr and Ajman rebelled against the authority of Ibn Saud and engaged in cross-border raids into parts of Trans-Jordan, Mandatory Iraq and Kuwaiti Emirate. The relationship between the House of Saud and the Ikhwan deteriorated into an open bloody feud in December 1928. The main instigators of the rebellion were defeated in the Battle of Sabilla, on 29 March 1929.