Since Mosul’s constraint by ISIS fighters in Jun 2014, Mosul has been a critical building for ISIS.
The largest city underneath ISIS control in Iraq and Syria, it was a city from that a organisation initial announced a investiture of the supposed caliphate.
Since then, ISIS has gradually mislaid the other Iraqi cities — Ramadi, Tikrit and Falluja — to supervision forces.
About 1 million people are estimated to sojourn in Mosul, once a worldly trade heart of 2 million residents.
Article source: http://www.cnn.com/2016/10/23/middleeast/mosul-iraq/index.html