An organisation as ruthless as IS isn’t going to seek popular approval before it acts but it can’t rely wholly on intimidation to gather recruits for a new campaign: it needs to retain some sympathy among the Sunni community at large. More important, it has always thrived on chaos: with its rivals at one another’s throats, it could exploit the vacuum of political and military power. For much of this year, chaos seemed to be on the way out, as normal life gradually returned to former battle zones in both Syria and Iraq – unpropitious conditions for IS. But in October the situation changed.
For a brief, astonishing period, this reborn caliphate governed, in brutal but well-organised fashion, a population of ten million, claiming divine inspiration in its pursuit of true Islamic principles. Its rise was spectacular, but so was its fall: it lost its final piece of territory, a village in the desert on the Syrian side of the border, six months before al-Baghdadi’s death.