(Al Jazeera) – “Daoud” said he wanted to fight “for revenge” after the Islamic State of Iraq and the Levant (ISIL) swept into Iraq’s Sinjar district in August 2014, killing thousands of adherents of the Yazidi religious minority and taking thousands more captive. Daoud’s family managed to flee, taking an escape route opened up by the People’s Defence Forces, the armed wing of the Kurdistan Workers’ Party (PKK). Those forces offered training and weapons to a Yazidi militia, the Sinjar Resistance Units. Six months later, Daoud, whose real name isn’t used for his safety, joined the militia. He was 15.