Regeneration by Pat Barker is a classic exploration of how the traumas of war brutalised a generation of young — published as a Penguin Essential for the first time. 'I just don't think our war aims — whatever they may be — and we don't know — justify this level of slaughter.' The poets and soldiers Siegfried Sassoon and Wilfred Owen are dispatched to Craiglockhart War Hospital in Scotland in 1...