One by one, the men arrive to volunteer for the battle ahead.<br/> <br />Iraqis flocked to recruitment centers on Sunday, like this one in Baghdad.<br/> <br />They're joining the fight against radical Sunni militants called ISIL.<br/> <br />They're an al Qaeda offshoot and they've seized towns and cities across the north of the country in just two weeks.<br/> <br />The fighting has divided Iraq along sectarian lines.<br/> <br />A division some Iraqis resist.<br/> <br />(SOUNDBITE) (Arabic) VOLUNTEER AHMED JASSIM SAYING:<br/> <br />"This is the cause of a country and it is not a cause of a Sunni or a Shi'ite. We have to cooperate to terminate the rats."<br/> <br />If official estimates are true, more than two million have volunteered over the past week.<br/> <br />This, after a call from the country's most influential Shi'ite cleric, to take up arms against a full-blown Sunni insurgency, that many here believe includes foreign fighters.<br/> <br />(SOUNDBITE) (Arabic) VOLUNTEER ABBAS JABBAR SAYING:<br/> <br />"We responded to the call to f
