 Following Yahya ibn Muhammad's withdrawal from Basra, the Zanj continued to maintain a presence in the city for trade purposes; several religious adherents also remained and continued to meet on certain Fridays until they were declared outlaws.As a result of the battle and massacre, the Abbasid government increased its efforts to combat the Zanj, but it was unsuccessful in making more than limited progress against them.On September 20, the commander Muhammad al-Muwallad departed from Samarra for the Basra region, where he was quickly defeated by Yahya ibn Muhammad and eventually forced to withdraw.