(Saturday, May 1, 1915; during World War I) — A German submarine today torpedoed and severely damaged the SS Gulflight, an American tanker near Britain’s Scilly Isles, even though the United States was still neutral in the Great War. Three crew members were killed.

Video: 'The Gallipoli Catastrophe Documentary'

(Sunday, April 25, 1915, during the Gallipoli Campaign in the Middle Eastern theatre of World War I) — Allied soldiers invaded the Gallipoli Peninsula today in an unsuccessful attempt to take the Ottoman Empire, Germany’s ally, out of the war. Continue reading Gallipoli Campaign begins 100 years ago today (Apr 25 1915) →

Video: '1915 AGHET - The Armenian Genocide (In English)'

(Saturday, April 24, 1915, during World War I) — What’s regarded as the start of the Armenian Genocide, which resulted in the death of one to 1.5 million people, began today as the Ottoman Empire rounded up and arrested some 250 Armenian intellectuals and community leaders in Constantinople. Continue reading Armenian Genocide begins 100 years ago today (Apr 24 1915) →

Video: 'Deadly Battles of World War I - Ypres the Gas Inferno'

(Thursday, April 22, 1915, at around 5:00 p.m. CET; part of the Western Front of World War I) — The first full-scale use of deadly chemicals in warfare took place today as German forces unleashed chlorine gas against Allied troops at the start of the Second Battle of Ypres in Belgium during World War I; thousands of soldiers are believed to have died. Continue reading Germans launch first-full scale use of deadly chemicals in warfare 100 years ago this hour (Apr 22 1915) →

Video: 'The First Battle of Champagne'

(Wednesday, March 17, 1915; part of the Western Front of World War I) — The First Battle of Champagne between the French Fourth Army and the German Third Army in the Champagne region of France ended today in stalemate after three months of bloody fighting.

Video: 'La bataille des Dardanelles (1915)'

(Friday, February 19, 1915, 7:30 a.m. local time; during Naval operations in the Dardanelles Campaign, part of World War I) — British and French warships launched their initial attack today on Ottoman forces in the Dardanelles, a strait in northwestern Turkey. The Gallipoli Campaign that followed proved disastrous for the Allies.

Video: 'The Great War episode 2 Stalemate' (Dec. 26, 1914, at 54:25)

(Saturday, December 26, 1914, 8:30 a.m. local time; on the Western Front of the First World War) — An unofficial Christmas truce that began two days ago on the Western Front ended today after German and British soldiers exchange pleasantries.

Video: 'The First Battle Of Ypres 1914'

(Sunday, November 22, 1914; part of the Race to the Sea on the Western Front of the First World War) — The First Battle of Ypres, fought for the strategically important town of Ypres in western Belgium, ended today with an Allied victory against Germany.

Video: 'World War I: Gavrilo Princip's Final Days'

(Wednesday, October 28, 1914; during World War I) — Yugoslav nationalist Gavrilo Princip, whose assassination of Archduke Franz Ferdinand of Austria and Sophie, Duchess of Hohenberg, sparked World War I, was sentenced today in Sarajevo to 20 years’ imprisonment, escaping the death penalty because he was underaged.