Operation Conquest or Operation Fatah is an ongoing offensive against ISIL's positions in Mosul and the surrounding region. The offensive is a joint effort by the Iraqi government forces with allied militias, Iraqi Kurdistan, limited US ground forces, and US and allied air support. It is part of the military intervention against ISIL, with the aim of pushing ISIL out of the second-largest city of Iraq, Mosul, as well as the rest of the Nineveh Governorate. The operation follows the Mosul offensive in 2015, which successfully recaptured parts of the region northwest of Mosul, but stopped short of breaching the city itself, for various reasons. The fall of Mosul to ISIL occurred between 4 and 10 June 2014.