Beginning primarily in 2017, as the Islamic State lost more swathes of territory and lost control over major settlements and cities, the group increasingly resorted to more terror bombings and insurgency operations, using its scattered underground networks of sleeper cells across regions in the middle east and various offshoots and adherents. The collapse of its final Middle Eastern territories in 2019 after the Battle of Baghuz Fawqani propelled the group into full insurgency phase in the regions it once controlled, while retaining influence via propaganda efforts and in remote hideouts, such as in the Syrian Desert.[132][133]