David Cameron made a reasonable case last week for Britain going to war with Isis in Syria; what he did not do is explain how this war is going to be won by Britain or anybody else. Even now, 18 months after Isis captured Mosul, there is a tendency by world leaders to underestimate its political and military strength.
Mr Cameron said that “military action [by the US, UK and others] seeks to degrade Isis’s capabilities, so that Iraqi security forces can effectively secure Iraq and moderate forces in Syria can defend the territory they control”.
It would certainly be nice if that happened, except that the Iraqi state security forces are demoralised, dysfunctional and have had difficulty finding new recruits since they have been repeatedly defeated by Isis over the past two years. In Syria, we are to look to 70,000 “moderate” fighters whose existence Mr Cameron revealed to the House of Commons, but nobody in Syria has ever heard of.