You can't win a war without winning some battles, but even winning a whole string of battles does not mean you've won the war. Take for example, the American-led war to, in President Trump's word, "annihilate" the Islamic State. In city after city, allied air attacks married to on-the-ground fighting by Iraqi and Syrian forces have forced IS to retreat from Ramadi, Tikrit, Falluja, Mosul and Raqqa. Why isn't the war over? As former US intelligence officer David Eneboe puts it in the title of his new book IT'S THE IDEOLOGY that has not been defeated. Ending the scourge of Islamism is what it's all about.