The First World War (also known as World War I, the Great War and in its time called the War to end all Wars, abbreviated WW1), was a conflict that involved the main empires of the age in a worldwide scale, but was centered on Europe. It lasted since the declaration of war by the Greater German Confederation to Great Britain in May, 1913, until the Peace of Salzburg in November, 1919.
The First World War had several causes from happening. The first of those was the hate between the Germans and the Ibero-Italians, that had started from the Seven Years War (1775-1782). Later, the Germano-French War in 1858, in which an unstable Kingdom of France had been defeated by Germany and lost all of Alsace-Lorraine excepting for a piece of land surrounding Metz and a small corridor connecting it with the rest of France. France despised Germany and Germany France. At the same time, Germany had a complex network of alliances, very different from the XVIII Century alliances, called the Eastern Alliance. Its components were Germany itself, the German puppet of Scandinavia, Russia, East Slavia (once Poland-Lithuania) and the Baltic nations. The Ottomans were friendly with the Eastern Alliance. Iberia-Italy also had a complex system of allies, called the Triple Alliance (later called the Entente Cordiale): This were Iberia-Italy itself, France, and Ireland. Greece was pro-Allied and had a protection pact with Hungary, while France and Great Britain were allies, although Great Britain didn't join the Entente Cordiale until 1913.
The First World War's original trigger was the region of Sudetenland. This region was German in majority, but many Czechs claimed it as part of their territory. Although both East Slavia and Germany were in the Eastern Alliance, it was well-known that most Czechs and Slovaks supported the Entente Cordiale and wanted independence, and therefore, if there was a terrorist attack upon any part of Sudetenland, the Entente would be blamed almost instantly.
1913/14: The Start of the War
Prince Ernst Heinrich of Saxony was on his visit on Pilzen, Sudetenland, trying to start a series of reforms that would pacify the Sudeten people, when a Bohemian terrorist (whose name got lost over time) assassinated him. German propaganda soon took the blame to Britain, and in May 5, 1913, war was declared. England had a mutual protection pact with France, which declared war upon Germany in May 7. In May 9, both Iberia-Italy and Ireland declared war. Greece, however, decided to stay neutral. Although Greece had interests in the West Slavic Prefecture of Bosnia (OTL Yugoslavia), and in the pro-Eastern Ottoman Empire, which had Rumelia (Thrace, Bulgaria and Romania), plus what the Greeks of the age called Ionia (the west coast of Turkey, the Black Sea coast, and much of South Turkey). This changed when, in June 26, 1914, the West Slavic overrun the Kingdom of Hungary. Greece immediately declared war on West Slavia and allied with the Entente.
However, this was not a good move as, under the Treaty of Constantinople of 1914, the Turks declared war on Greece. Another landing on the Chalkidi Peninsula by Russian troops left the Greeks fighting on a scale of two Eastern Alliance soldiers against one Greek. The Greeks resisted bravely, but by the end of 1914, they had been taken back to the southern border of Thessaly.
France and Italy were almost as bad. The Ibero-Italians had lost several battles, starting with Trento in June 10, 1914 and ending with Venice in January 5, 1915. The whole Veneto and Tiroli regions had been lost, and Lombardia and Emilia were about to be taken by the Germans by the start of 1915. In France, the Germans had taken Metz almost immediately and then advanced west, trying to surround Paris through the forests of the Low Countries, where France hardly expected a fight. The plan also crossed through Switzerland south. This Schleiffen Plan had worked perfectly, and by the end of the year, Paris had been surrounded and the French government had moved to the second largest city in France, Poitiers. King Phillippe VIII escaped Paris and went into hiding in Nantes, leaving the country temporarily under interim government control.
At the end of 1914, things looked gloomy for the Entente.
1915: the Mud War
the winter of late 1914/1915 was an especially cold and humid winter. A