What were the major battles and campaigns of World War I, and how did they shape the course of the conflict?

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1. Battle of the Marne (September 1914): This battle stopped the German advance into France and marked the beginning of trench warfare. It prevented a quick German victory and ensured the war would be long and drawn out.

2. Battle of Gallipoli (April 1915-January 1916): This campaign, aimed to knock Turkey out of the war and secure a sea route to Russia, ended in failure for the Allies. It led to the resignation of British First Lord of the Admiralty, Winston Churchill, and encouraged other countries to join the Central Powers.

3. Battle of Jutland (May 1916): The largest naval battle of the war between the British Royal Navy and the German High Seas Fleet resulted in a strategic stalemate. However, the British maintained their naval blockade of Germany, contributing to ongoing economic struggles and resentment within Germany.

4. Battle of the Somme (July-November 1916): One of the bloodiest battles in history, with over one million casualties, the Somme marked the first use of tanks by the Allies. Though the battle resulted in limited territorial gains for the Allies, it significantly weakened the German army.

5. Battle of Verdun (February-December 1916): The longest battle of the war, both sides suffered heavy casualties without either achieving a decisive victory. The battle led to a loss of military and civilian morale in France and contributed to widespread war-weariness.

6. Battle of Passchendaele (July-November 1917): Also known as the Third Battle of Ypres, this battle was marked by heavy rain and mud, making it difficult for either side to make significant advances. Casualties were high, and the eventual Allied gains were minimal.

7. Battle of Cambrai (November-December 1917): Notable for the first successful use of massed tanks by the British, this battle demonstrated that tanks could be a decisive weapon in breaking through enemy lines.

8. German Spring Offensive (March-July 1918): A series of German offensives aimed to win the war before significant American forces arrived in Europe. While initially successful, they ultimately failed due to exhausted German resources and the arrival of American troops.

9. Battle of the Hundred Days (August-November 1918): A series of coordinated Allied offensives that led to the German retreat, the collapse of the Central Powers, and the end of the war on November 11, 1918.

These battles and campaigns shaped the course of World War I by demonstrating the devastating effects of modern warfare, leading to massive casualties and a prolonged conflict. The final Allied victory in 1918 resulted in the collapse of the Central Powers, the end of German, Austro-Hungarian, and Ottoman empires, and the re-drawing of the map of Europe in the Treaty of Versailles, which ultimately contributed to the rise of Adolf Hitler and the events leading to World War II.