Via The War Files– The US-backed Syrian Democratic Forces (SDF) have officially kicked off the Raqqa offensive. A three-fronted attack was launched from the north, east and west of the city last night. SDF forces have already managed to penetrate the city’s eastern gate. The US-led coalition said the operation would deliver a “decisive blow to the idea of ISIS as a physical caliphate”. The SDF, who’s not aligned with Syrian President Assad nor the rebels seeking to overthrow him, has driven Daesh about 6,000 sq km (2,300 sq miles) from northern Syria since October 2015. The SDF has been gradually encircling Raqqa since November.