Iraq 's top religious and political leaders call for volunteers to defend against ISIS . The group has been fighting the Iraqi government since 2014, but it is still a relatively small force compared with other Sunni militant groups in Iraq. `` Those terrorists must be driven out , and by God 's will they will be driven out , '' says a volunteer .
Iraq 's top religious and political leaders call for volunteers to defend against ISIS . Thousands -- mostly young Shiites -- answer the call . `` Those terrorists must be driven out , and by God 's will they will be driven out , '' says a volunteer .