Much of the fighting in World War I took place along the Western Front, within a system of opposing manned trenches and fortifications (separated by a "no man's land") running from the North Sea to the border of Switzerland. On the Eastern Front, the vast eastern plains and limited rail network prevented a trench warfare stalemate from developing, although the scale of the conflict was just as large. Hostilities also occurred on and under the sea and — for the first time — in the air. More than nine million soldiers died on the various battlefields, and millions more civilians perished.
The war caused the disintegration of four empires: the Austro-Hungarian, German, Ottoman, and Russian. Germany lost its overseas empire, and states such as Czechoslovakia and Yugoslavia were created, or recreated, as in the cases of Lithuania and Poland. This contributed to a decisive break with the world order that had emerged after the Napoleonic Wars, which was modified by the mid-19th century’s nationalistic revolutions. The results of World War I would also be important factors in the development of World War II just over two decades later.
The Paris Gun (German: Parisgeschütz) was the name of an artillery piece with which the Germans bombarded Paris during World War I. This oversized railway gun was used from March to August 1918. When it was used, Parisians believed they were being bombed by an airship, because neither the sound of an airplane nor of a gun could be heard. It was the largest gun used during the war, and is considered to be a supergun.
Also called the "Kaiser Wilhelm Geschütz" (Kaiser Wilhelm Gun), it is often confused with Big Bertha, the howitzer used by the Germans against the Liège forts in 1914, and indeed the French called it by this name as well. It is also confused with the smaller "Langer Max" (Long Max) cannons from which it was derived. Although the famous Krupp-family artillery makers produced all these guns, the resemblance ended there.
...that the Lake Tanganyika passenger ferry MV Liemba began its life as a German warship in World War I, spent eight years on the bottom of the lake, and later portrayed the Empress Luisa in the film The African Queen?