Some had foreseen the nature of the war. One great soldier, Helmuth von Moltke, warned the German Reichstag as early as 1890 that the next war would be a Volkskrieg, a war of peoples, a war of nations. And first there had to be nations to make such a war. The nation-state had developed in the 19th century. Throughout Western Europe, schoolchildren were being taught that they belonged to the greatest nation in the world — the British, the German, the French, not least the Serb — and one for which they must be prepared, if necessary, to die. By the beginning of the 20th century statesmen had to take account of a public opinion, especially among the urban middle classes, that was swayed by irrational but immensely powerful concerns for national greatness and national honour.