From Wikipedia

 The Gallipoli Disaster

 The Gallipoli Campaign, also known as the Dardanelles Campaign or the Battle of Gallipoli, took place at the peninsula of Gallipoli in the Ottoman Empire between 25 April 1915 and 9 January 1916, during the First World War. A joint British and French operation was mounted to capture the Ottoman capital of Constantinopole and secure a sea route to Russia. The attempt failed, with heavy casualties on both sides.

The Gallipoli campaign resonated profoundly among all nations involved. In Turkey, the battle is perceived as a defining moment in the history of the Turkish people—a final surge in the defence of the motherland as the centuries-old Ottoman Empire was crumbling. The struggle laid the grounds for the Turkish War of Independence and the foundation of the Republic of Turkey eight years later under Mustafa Kemal Pasha, himself a commander at Gallipoli.