The Economist asks: How is warfare changing?

Anne McElvoy, our senior editor, went on an outing of top-brass Anglo-German military — to discuss how they are preparing for future risks of urban warfare. She had exclusive access to a mock city in eastern Germany - and visited Nazi bunkers where armies are learning from decisive urban battles in history. And they explore the way ISIS and a renewed threat from Russia is changing conflict scenarios.

Music by Chris Zabriskie (CC by 4.0 UK)

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