2014 Islamic State offensive in Iraq
In June 2014, the Islamic State of Iraq and the Levant (also known as ISIL or ISIS), which had controlled a large portion of Northeastern Syria at that time during the Syrian civil war, launched a widespread offensive in Iraq, capturing a large swath of territory extending all the way from the Iraq–Syria border to the outskirts of the Iraqi capital city of Baghdad. The offensive came after months of clashes in Anbar province, where tribal groups, and some extremist factions—which had pledged allegiance to ISIL—had been fighting Iraqi government forces in the cities of Fallujah and Ramadi following a series of anti-government protests.
Source: Wikipedia — 2014 Islamic State offensive in Iraq (CC BY-SA 4.0)