In The Great War, many Points of Divergence or POD's appear, here is a list of the POD's that have happened so far:
1910 - 1920[]
1914 - Russia adopts Trench Warfare, leading to a longer war.
1915 - to be announced
1916 - to be announced
1917 - to be announced
1918 - to be announced
1919 - to be announced
1920 - to be announced