This photograph was taken while McCullin was on assignment for ‘The Sunday Times Magazine’ and was first published as part of a photo-story entitled ‘War on the Home Front’ in December 1971. It depicts a group of Catholic boys escaping over a wall, following an attack of CS gas in a burnt-out sorting office in Little Diamond, an area in Derry/Londonderry. McCullin’s use of diagonal lines as a framing device enhances the sense of movement, while his sharp focus and strongly contrasting light and dark tones add to the drama of the image, in which the boys appear vividly silhouetted against the cloud of CS gas rising behind them and seeping over the wall.