The Gallipoli Campaign, also known as the Dardanelles Campaign or the Battle of Gallipoli or the Battle of Çanakkale (Turkish: Çanakkale Savaşı), took place at the peninsula of Gallipoli in the Ottoman Empire (now Gelibolu in modern day Turkey) 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 Istanbul (then still referred to as 'Constantinople' by Western nations) and secure a sea route to Russia. The attempt failed, with heavy casualties on both sides. The campaign was considered one of the greatest victories of the Turks and was reflected on as a major failure by the Allies.
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 aging 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 Atatürk, himself a commander at Gallipoli.
The campaign was the first major battle undertaken by the Australian and New Zealand Army Corps (ANZAC), and is often considered to mark the birth of national consciousness in both of these countries.  Anzac Day, 25 April, remains the most significant commemoration of military casualties and veterans in Australia and New Zealand, surpassing Armistice Day/Remembrance Day.