One hundred years ago the First World War set the course for the modern world: for the countries that took part nothing would be the same again. In these special editions of The Essay we gain an international perspective on the war as we hear from cultural figures from around the world taking part in an international series of events called The War That Changed The World, made in partnership with the British Council and the BBC World Service. Herlinde Koebl, is an artist and photographer known for her in-depth, political and thematic work. In this essay she draws on the experience of her latest project 'Targets' which was a series of documentary photographs of the targets used for training by soldiers in 30 countries. Contrasting accounts of First World War training, and quoting from contemporary soldiers, Herlinde Koebl asks what makes a soldier able to kill? The essay is performed in front of an audience at the Bundeswehr Military Museum in Dresden.