But by stopping in 1941, Baker avoids arguing about what did bring the war to an end. And what would have happened if the war had not been fought at all? Could it have been any worse? Would an even greater holocaust have taken place — albeit at a more leisurely pace? Or would nonviolence, widely and determinedly practised, have prevailed?

Baker does not pretend to know. Nor can we. But his book makes a strong case, and makes it originally and with astonishing attack and verve, that history having given the fight-fire-with-fire mob their chance, we should just for once try fighting fire with water.

‘Our way of passive resistance has never yet been tried out,’ said the Labour MP George Lansbury in 1939, ‘but war has been tried through all the centuries and has absolutely failed.’ Right on.

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