IS' battle plan for its defence of Mosul

So-called Islamic State's (IS) battle plan for its defence of Mosul is gradually being revealed, as Iraqi and Kurdish forces advance on the city.

Richard Galpin looks at the four main tactics IS are employing, which it has probably been working on since it seized control of Mosul in June 2014.

from BBC News - World http://ift.tt/2dQnw27