On the western side, some territory in the Azaz district stayed under the control of non-ISIL forces, villages and towns occasionally contested and changing hands between Afrin District based YPG and allies (all since October 2015 under the umbrella of the Syrian Democratic Forces, SDF) and diverse rebel militias, until finally a February 2016 offensive by SDF forces, inter alia capturing Tel Rifaat and Menagh Airbase, created today's borderline between them.[18][19]