All worked excellently, until fighting began. - John Keegan

The accidents of military geography also began to work to the Germans’ disadvantage. The nearer they approached Amiens, the more deeply did they become entangled in the obstacles of the old Somme battlefield, a wilderness of abandoned trenches, broken roads and shell-crater fields left behind by the movement of the front a your earlier. The Somme may not have won the war for the British in 1916 but the obstacle zone it left helped to ensure that in 1918 they did not lose it.

The First World War was a tragic and unnecessary conflict. Unnecessary because the train of events that led to its outbreak might have been broken at any point during the five weeks of crisis that preceded the first clash of arms, had prudence or common goodwill found a voice; tragic because the consequences of the first clash ended the lives of ten million human beings, tortured the emotional lives of millions more, destroyed the benevolent and optimistic culture of the European continent and left, when the guns at last fell silent four years later, a legacy of political rancour and racial hatred so intense that no explanation of the causes of the Second World War can stand without reference to those roots.

Within fifteen years of the war’s end, totalitarianism, a new word for a system that rejected the liberalism and constitutionalism which had inspired European politics since the eclipse of monarchy in 1789, was almost everywhere on the rise. Totalitarianism was the political continuation of war by other means.