The effect exerted by paper plans on the unfolding of events must never be exaggerated. Plans do not determine outcomes. The happenings set in motion… - John Keegan

The 1914 battles in the Eastern Front therefore closely resemble those fought by Napoleon a hundred years earlier, as indeed did those of the Marne campaign, with the difference that infantry lay down rather than stood up to fire and that the fronts of engagement extended to widths a hundred times greater. The duration of battles extended also, from a day to a week or more. The outcomes, nevertheless, were gruesomely similar: huge casualties, both absolutely and as a proportion of numbers engaged, and dramatic results.

The basic and stark fact, nevertheless, was that the conditions of warfare between 1914 and 1918 predisposed towards slaughter and that only an entirely different technology, one not available until a generation later, could have averted such an outcome.
The first day of the battle of the Somme, 1 July 1916, was to be an awful demonstration of that truth.

All European armies in 1904 had long-laid military plans, notable in most cases for their inflexibility. None was integrated with what today would be called a ‘national security policy’, made in conclave between politicians, diplomats, intelligence directors and service chiefs, and designed to serve a country’s vital interests, for such a concept of national leadership did not then exist. Military plans were held to be military secrets in the strictest sense, secret to the planners alone, scarcely communicable in peacetime to civilian heads of government, often not from one service to another.