Names, places and dates origins - now or never the plans of war the great gamble, 1914 towards industrialized war, 1915 dual defeats, 1916 - from the Meuse to the Sereth the long-war reality, 1915-16 survival a sea-change 1917 the levy, 1917-18 operation Michael - the last card defeat, 1918-19.
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Showalter et al. (1997) studied this question.