Sounds like an unstoppable army.
Check it out:

A State Department official who just returned from a seven-week trip to Iraq, said the Islamic State of Iraq and Syria (ISIS) – or the Islamic State of Iraq and Levant (ISIL) – is no longer just a terrorist group.

“ISIL is no longer simply a terrorist organization,” Brett McGurk, deputy assistant secretary for Iraq and Iran at the U.S. Department of State, said at a House Foreign Affairs Committee hearing on Wednesday. “It is now a full-blown army seeking to establish a self-governing state through the Tigress and Euphrates Valley in what is now Syria and Iraq.”