BBC News looks at some of the key events which have shaped the confrontation with Islamic State in the 12 months since the fall of Mosul.
The brutality and oppression of life under IS is revealed by exclusive video and testimony from Iraq's second city of Mosul, a year after it fell.
What explains the ultra-violent group's behaviour?
Jihadist group's rise to power, in video and text
Why the fight against Islamic State looks to be a long one