Patrick Cockburn

On 16 June, Kurdish militiamen, with the support of US airstrikes, captured the town of Tal Abyad in northern Syria, a major crossing point on the Syrian-Turkish border. Its fall is damaging to Islamic State: it cuts the road linking the caliphate’s unofficial Syrian capital at Raqqa, sixty miles to the south, to Turkey and the outside world. Down this road have come thousands of foreign volunteers, many of whom became suicide bombers. Now the movement is all the other way: some 23,000 Arab and Turkmen refugees have fled into Turkey to escape the advancing Kurds.

The​ Islamic State is becoming even more repressive and violent as it comes under increased military pressure from its many enemies. It shows no mercy to those who resist its rule – such as the Albu Nimr tribe in western Iraq, 581 members of which Isis recently executed. This isn’t random slaughter: Isis has a well-organised security service that strikes pre-emptively at...

Over the summer Isis – the Islamic State of Iraq and Syria – defeated the Iraqi army, the Syrian army, the Syrian rebels and the Iraqi Kurdish peshmerga; it established a state stretching from Baghdad to Aleppo and from Syria’s northern border to the deserts of Iraq in the south. Ethnic and religious groups of which the world had barely heard – including the Yazidis of Sinjar and the Chaldean Christians of Mosul – became victims of Isis cruelty and sectarian bigotry. In September, Isis turned its attention to the two and a half million Syrian Kurds who had gained de facto autonomy in three cantons just south of the Turkish border.