The Southeast Asia fighting unit of the Islamic State of Iraq and Syria (ISIS), Katibah Nusantara (KN) continues to expand geographically within a year of its establishment. There are about 450 Indonesians and Malaysians, including children and women under fealty to ISIS in Iraq and Syria today. KN or Majmuah Al Arkhabiliy in Arabic, started out with some 100 Indonesian and Malaysian fighters when it was formed in Shaddadi, Hasakah in Syria in September 2014. It has since the middle of this year, divided into three geographical groupings: KN Central led by Bahrum Syah, Katibah Masyariq led by Salim Mubarok At-Tamimi alias Abu Jandal, based in Homs and Katibah Aleppo led by Abu Abdillah. Bahrum Syah remains amir of KN, dealing strictly with Indonesian ISIS fighters that defy or defect from KN’s instructions, to maintain unity within ISIS.