Zanj Rebellion
The Zanj occupation of al-Ubulla () was an event of the Zanj Rebellion, occurring on June 28, 870. Zanj troops dispatched by their leader 'Ali ibn Muhammad advanced against the city of al-Ubulla on the Tigris and launched an attack against it. Despite a defense set up by the Abbasid government to protect the city, it was successfully stormed and taken by the rebels. Much of al-Ubulla was destroyed and many of its inhabitants were killed during the assault.