European theatre of World War I
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Although considerable conflict took place outside Europe, the European theatre (also known as the First European War) was the main theatre of operations during World War I and was where the war began and ended. During the four years of conflict, battle was joined by armies of unprecedented size equipped with new mechanized technologies, leaving millions dead or wounded.
The European theatre is divided into four main theatres of operations: the Western Front, the Eastern Front, the Italian Front, and the Balkans Front. Not all of Europe involved in the war. Nor did fighting take place throughout all of the major combatants territory. The United Kingdom was nearly untouched by the war. Most of France was unaffected, as was most of Germany and Italy.
Some large countries in Europe remained neutral for the entire war such as Sweden and Spain – the Great War passed them by without much impact. On the other hand, some countries were conquered (Serbia, Belgium, Romania). Other countries like Russia and the Ottoman Empire saw armies marching over much of their lands, with a great deal of resulting devastation.
Although the United States did join the war, due to Great Britain's control over the Atlantic Ocean, the only fighting for the U.S. Army was in Europe on the Western Front. The American army was transported by ship across the ocean so it could fight the Germans in France.
The Western Front was the scene of continuous combat from the start of the war until the last day of the war, November 11, 1918. The fighting on the Western Front was mainly confined to the north-eastern part of France as well as Belgium. Most of France was not fought over, and the Netherlands remained neutral for the entire war.
The Western Front involved the allied powers of France, the British Empire, Belgium, and America fighting against the armed forces of the German Empire.
The fighting on the Eastern Front was primarily contested by the German army and the Austro-Hungarian army on one side and the forces of the Russian Empire and Romania on the other. The Eastern front covered a very large territory, from the Baltic in the north to the Black Sea in the south and from Prussia and Galicia in the west to Latvia and Minsk to the east.
The fighting on this front ended early, with the last significant military operation taking place in the autumn of 1917. The two Russian Revolutions of 1917 forced Russia out of the war. The Bolshevik government that took power in November 1917 had promised an end to the war and that government signed the Treaty of Brest-Litovsk which ended the war for Russia in March 1918.
The Italian Front covered only a small part of northern Italy and the western border of Austria-Hungary. The fighting here began on 23 May 1915 and lasted till 3 November 1918. Most of the fighting was concentrated on a very small bit of land between the Alps and the Adriatic, near the town of Trieste.
The fighting primarily involved Italy and Austria-Hungary but also included smaller contingents from France, the UK, and the US (who fought on the side of Italy), and Germany (who was allied with Austria-Hungary).
The Balkans Front covered all of Serbia, Montenegro, Albania, and Romania. It also covered northern Greece, the western part of Bulgaria, and the south and eastern parts of Austria-Hungary. Very little fighting took place in this theatre for long periods of time. It was considered a lesser theatre of war by the Great Powers.
The Central Powers of Austria-Hungary, Germany, Bulgaria, and the Ottoman Empire were opposed by the allied powers of Serbia, France, the United Kingdom, Romania, Russia, Montenegro, and Greece.
Because of the dominance of the British and French navies, only limited fighting took place in the seas around Europe. The German U-Boat fleet tried to sink British merchant ships, with some success early in the war. German U-Boats had only moderate cruising range in this war and operated mostly in the North Sea, the Irish Sea and in the Mediterranean. The German U-Boat threat was drastically reduced when the British finally adopted a convoy system in early 1917.
There was one great battle in the waters near Europe: the Battle of Jutland 31 May 1916 – 1 June 1916 between the German High Seas Fleet and the British Grand Fleet. This was one of the largest sea battles in world history though, in some respects, the battle was inconclusive.
In the Adriatic, some very limited sea combat took place between the navy of Austria-Hungary and the Allied navies of France, Britain, and Italy. The strategy of the Allies was to blockade the Adriatic and monitor the movements of the Austrian fleet. In general, this strategy was successful but the Germans and the Austrians were able to send submarines out into the Mediterranean where they did some damage. The main sea base for the Austrian and German fleet in the Adriatic was Pola (modern day Pula in Croatia).
Japan, an ally of the United Kingdom, sent some destroyers to the Mediterranean and they were very effective in patrol and anti-submarine activity. By contrast the Italian Navy was "languid and apathetic" (Cyril Falls "The Great War" p. 295). The only significant naval battle occurred on 15 May 1917 when three Austrian cruisers under Captain Miklós Horthy staged a raid on some Italian and British transports near Valona Albania. The raid was a partial success but the raiders were nearly destroyed by shell fire from Italian ships that chased them back to Pola.
In the Black Sea, the Russian fleet was dominant and it was led by two skilled commanders, Admiral Eberhart and then Admiral Kolchak (who took over in 1916). By the end of 1915, the Russian fleet had nearly complete control of the sea. The Black Sea fleet was used mainly to support General Yudenich in his Caucasus Campaign.
In the Baltic Sea, the Russian fleet was essentially inactive, hiding behind the belts of mines which stretched across the entry into the Gulf of Finland. So the German Baltic fleet dominated the sea and was of occasional use to the German army on the Eastern front.