1. Battle of the Marne(August-September 1914): As the German army was advancing deep into France, the French and British launched a counter-offensive at the Marne River, halting German advance and marking a crucial turning point in the war.
2. Battles of Ypres(1914-1918): A series of battles fought on the Western Front in Belgium. The first Battle of Ypres(October-November 1914) prevented the German army from capturing the port of Ypres.
3. Battle of Gallipoli(1915-1916): A failed Allied campaign to capture the Gallipoli peninsula in Turkey, aiming to gain control of the Dardanelles straits and open supply route to Russia.
4. Battle of Verdun(February-December 1916): A lengthy battle fought in France where German forces launched a massive offensive against the fortified city of Verdun. It's remembered for its intense fighting and heavy causalities on both sides.
5. Battle of the Somme(July-November 1916): One of the largest battles of the war, fought on the Western Front. The British and French armies launched a major offensive but made limited gains while suffering extensive loses.
6. Brusilov Offensive(June-September 1916): A successful Russian offensive on the Eastern Front against Austrian forces. It achieved territorial gains for Russia and relieved some pressure on the Western Front.
7. Third Battle of Ypres(Passchendaele)(July-November 1917): Another British offensive in Belgium. The battle was marred by challenging conditions, including heavy rains and mud, leading to significant causalities and limited progress.
8. Battle of caporetto(October-December 1917): An Austro-German victory against Italy, leading to a retreat of Italian forces and territorial loses.
9. Battle of Amiens (August 1918): A successful British offensive on the Western Front, breaking through German lines and contributing to the eventual Allied advances
10. Meuse-Argonne Offensive(September-November 1918): The final major Allied offensive of the war, involving American, French, and British troops. It pushed back German forces and eventually led to the armistice that ended World War 1 on November 11, 1918.
These battles played crucial roles in shaping the course of the war and are remembered for their strategic importance and the heavy human cost they inflicted on all sides involved.