Al Jazeera's Victoria Gatenby looks at key moments since the Islamic State of Iraq and the Levant (ISIL) group swept into Iraq two years ago. It captured cities as part of a plan to establish a caliphate throughout the region. - Subscribe to our channel: http://aje.io/AJSubscribe - Follow us on Twitter: https://twitter.com/AJEnglish - Find us on Facebook: https://www.facebook.com/aljazeera - Check our website: http://www.aljazeera.com/