The Western Front was one of the main theatres of war during the First World War. Following the outbreak of war in August 1914, the German Army opened the Western Front by invading Luxembourg and Belgium, then gaining military control of important industrial regions in France. The German advance was halted with the Battle of the Marne. Following the Race to the Sea, both sides dug in along a meandering line of fortified trenches, stretching from the North Sea to the Swiss frontier with France, the position of which changed little except during early 1917 and again in 1918.
The British Expeditionary Force (BEF) was the six-divisions the British Army sent to the Western Front during the First World War. Planning for a British Expeditionary Force began with the 1906–1912 Haldane Reforms of the British Army carried out by the Secretary of State for War Richard Haldane following the Second Boer War (1899–1902).
Technology during World War I (1914–1918) reflected a trend toward industrialism and the application of mass-production methods to weapons and to the technology of warfare in general. This trend began at least fifty years prior to World War I during the American Civil War of 1861–1865, and continued through many smaller conflicts in which soldiers and strategists tested new weapons.
The Eastern Front or Eastern Theater of World War I was a theater of operations that encompassed at its greatest extent the entire frontier between Russia and Romania on one side and Austria-Hungary, Bulgaria, the Ottoman Empire, and Germany on the other. It ranged from the Baltic Sea in the north to the Black Sea in the south, involved most of Eastern Europe, and stretched deep into Central Europe. The term contrasts with the Western Front, which was being fought in Belgium and France.
The United Kingdom was a leading Allied Power during the First World War of 1914–1918. They fought against the Central Powers, mainly Germany. The armed forces were greatly expanded and reorganised—the war marked the founding of the Royal Air Force. The highly controversial introduction, in January 1916, of conscription for the first time in British history followed the raising of one of the largest all-volunteer armies in history, known as Kitchener's Army, of more than 2,000,000 men. The outbreak of war was a socially unifying event. Enthusiasm was widespread in 1914, and was similar to that across Europe.
The identification of the causes of World War I remains a debated issue. World War I began in the Balkans on July 28, 1914, and hostilities ended on November 11, 1918, leaving 17 million dead and 25 million wounded. Moreover, the Russian Civil War can in many ways be considered a continuation of World War I, as can various other conflicts in the direct aftermath of 1918.
The Allies, or the Entente Powers, were an international military coalition of countries led by France, the United Kingdom, Russia, the United States, Italy, and Japan against the Central Powers of Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria in World War I (1914–1918).
The Rape of Belgium was a series of systematic war crimes, especially mass murder and deportation, by German troops against Belgian civilians during the invasion and occupation of Belgium during World War I.
During World War I, the German Empire was one of the Central Powers. It began participation in the conflict after the declaration of war against Serbia by its ally, Austria-Hungary. German forces fought the Allies on both the eastern and western fronts, although German territory itself remained relatively safe from widespread invasion for most of the war, except for a brief period in 1914 when East Prussia was invaded. A tight blockade imposed by the Royal Navy caused severe food shortages in the cities, especially in the winter of 1916–17, known as the Turnip Winter. At the end of the war, Germany's defeat and widespread popular discontent triggered the German Revolution of 1918–1919 which overthrew the monarchy and established the Weimar Republic.
The Serbian campaign was a series of military expeditions launched in 1914 and 1915 by the Central Powers against the Kingdom of Serbia during the First World War.
The military history of Canada during World War I began on August 4, 1914, when the United Kingdom entered the First World War (1914–1918) by declaring war on Germany. The British declaration of war automatically brought Canada into the war, because of Canada's legal status as a British Dominion which left foreign policy decisions in the hands of the British parliament. However, the Canadian government had the freedom to determine the country's level of involvement in the war. On August 4, 1914, the Governor General declared a war between Canada and Germany. The Militia was not mobilized and instead an independent Canadian Expeditionary Force was raised.
Laschitza, Annelies; Keller, Elke (1982). Karl Liebknecht: Eine Biographie in Dokumenten [Karl Liebknecht: A Biography in Documents]. Frankfurt a.M: Verl. Marxistische Blätter. p. 214. ISBN 978-3-88012-660-2.
The 1917 French Army mutinies took place amongst French Army troops on the Western Front in northern France during World War I. They started just after the unsuccessful and costly Second Battle of the Aisne, the main action in the Nivelle Offensive in April 1917. The new French commander of the armies in France, General Robert Nivelle, had promised a decisive victory over the Germans in 48 hours; morale in French armies rose to a great height and the shock of failure soured their mood overnight.
The United States entered into World War I in April 1917, more than two and a half years after the war began in Europe.
The United States declared war on the German Empire on April 6, 1917, nearly three years after World War I started. A ceasefire and armistice were declared on November 11, 1918. Before entering the war, the U.S. had remained neutral, though it had been an important supplier to the United Kingdom, France, and the other powers of the Allies of World War I.
The home front during World War I covers the domestic, economic, social and political histories of countries involved in that conflict. It covers the mobilization of armed forces and war supplies, lives of others, but does not include the military history. For nonmilitary interactions among the major players see Diplomatic history of World War I.
The history of Belgium in World War I traces Belgium's role between the German invasion in 1914, through the continued military resistance and occupation of the territory by German forces to the armistice in 1918, as well as the role it played in the international war effort through its African colony and small force on the Eastern Front.
The economic history of World War I covers the methods used by the First World War (1914–1918), as well as related postwar issues such as war debts and reparations. It also covers the economic mobilization of labour, industry, and agriculture leading to economic failure. It deals with economic warfare such as the blockade of Germany, and with some issues closely related to the economy, such as military issues of transportation. For a broader perspective see Home front during World War I.
World War I was the first war in which mass media and propaganda played a significant role in keeping the people at home informed on what occurred at the battlefields. It was also the first war in which governments systematically produced propaganda as a way to target the public and alter their opinion.
The diplomatic history of World War I covers the non-military interactions among the major players during World War I. For the domestic histories of participants see home front during World War I. For a longer-term perspective see international relations (1814–1919) and causes of World War I. For the following (post-war) era see international relations (1919–1939). The major "Allies" grouping included Great Britain and its empire, France, Russia, Italy and the United States. Opposing the Allies, the major Central Powers included Germany, Austria-Hungary, the Ottoman Empire (Turkey) and Bulgaria. Other countries also joined the Allies. For a detailed chronology see timeline of World War I.
