 Complete the following phrase:  In 2014, Ad Abu Amjad joined the Northern Sun Battalion, whose leaders included Abu Layla. In late 2014, the Northern Sun Battalion withdrew from its headquarters in Manbij after the Islamic State of Iraq and the Levant took control of the city. While Abu Layla withdrew to Kobanî, Ad headed to Afrin. In September 2014, Ad was deployed to Kobanî to defend the city against an 