The First World War was ferocious in its first years. But the combination of sustained and enormous losses of the enormous battles of 1916 and the strains on the home fronts brought the "deeper forces" to emerge, in the words of historian René Albrecht-Carrier. The number of enormous battles—and casualties—across the military theaters in the year 1916 staggers the imagination: Verdun, the Somme, Jutland, the Brusilov Offensive, the Siege of Kut, and five of the Isonzo front battles, as well as other actions. The death toll was barely fathomable. General Aleksei Brusilov's offensive alone, ended with a death toll (not casualty toll) of over a million men (when deaths from both sides are combined). These Brusilov deaths occurred over a period of just under four months.
But 1916 had its own logic, really. Stalemate was the hallmark of the Western Front and some other fronts, but in all theaters, a kind of larger stalemate had held sway already by 1915. On all fronts, 1915 was a period of intensive experimentation for breaking the deadlock: poison gas; undermining and explosion of enemy trenches; flamethrowers; proliferation of machine guns, trench mortars, and more. Above all, the dramatic rise in artillery shelling to prepare for breakthrough dominated the thinking of high commands. But breakthrough to "the green fields beyond" remained illusive nearly everywhere in 1915.
In the case of the Western Front, Allied representatives met at Chantilly, France, in early December 1915 to coordinate offensives for the coming year, all agreeing to attack on a large scale as soon as possible. The Germans got there first, however, and delivered a massive blow at Verdun. This disruption delayed the Allied attacks somewhat, but the British and French were able to launch the Somme Offensive on July 1, 1916.
The well-known human result on the Somme was slaughter. More on that in weeks to come. But it was also slaughter in these other terrible conflicts.
Men like David Lloyd George in Britain and Albert Thomas in France came to fore as ministers of munitions who could break the old limitations on government transfers of private wealth through taxes, inflation, confiscation, etc. in order to produce the shells now thought to be needed in the war. The 1916 Hindenburg Program in Germany did the same but went much further in eroding individual rights and creating the total war system.
Although the war became even more ferocious before the end, 1916 stands as the year that finally broke the old world.
More analysis on the home front and battle front aspects of 1916 may be found in the new and expanded edition of my book, The Western Front (now retitled The Great War: Western Front and Home Front http://www.amazon.com/Great-War-Western-Front-Home/dp/1137471263).