WHAT ALL HAPPENED FEBRUARY TO SEPTEMBER 1915
Find out what all happened February to September 1915

The RMS Lusitania departs from New York City on her two hundred and second, and final, crossing of the North Atlantic. Six days later, the ship is torpedoed off the coast of Ireland with the loss of 1,198 lives, including 128 Americans, rousing American sentiment against Germany. (1. May 1915)

A story in New York World reveals that the Weimar German government had purchased excess phenol from Thomas Edison that could be used to make explosives for the war effort and diverted it to Bayer for aspirin production. (15. August 1915)

The last British Liberal Party government (led by Herbert Henry Asquith) falls. (17. May 1915)

World War I: The first naval attack on the Dardanelles begins when a strong Anglo-French task force bombards Ottoman artillery along the coast of Gallipoli. (19. February 1915)

Three trains collide in the Quintinshill rail disaster near Gretna Green, Scotland, killing 227 people and injuring 246; the accident is found to be the result of non-standard operating practices during a shift change at a busy junction. (22. May 1915)

World War I: Italy joins the Allies after they declare war on Austria-Hungary. (23. May 1915)

William Jennings Bryan resigns as Woodrow Wilson's Secretary of State over a disagreement regarding the United States' handling of the sinking of the RMS Lusitania. (9. June 1915)

World War I: The German 12th Army occupies Warsaw during the Gorlice–Tarnów Offensive and the Great Retreat of 1915. (4. August 1915)

Jewish American Leo Frank is lynched for the alleged murder of a 13-year-old girl in Marietta, Georgia, United States. (17. August 1915)

A Category 4 hurricane hits Galveston, Texas with winds at 135 miles per hour (217 km/h). (17. August 1915)

The arrest of 250 Armenian intellectuals and community leaders in Istanbul marks the beginning of the Armenian Genocide. (24. April 1915)

World War I: Battle of Sari Bair – the Allies mount a diversionary attack timed to coincide with a major Allied landing of reinforcements at Suvla Bay. (6. August 1915)

First Order of the Arrow ceremony takes place and the Order of the Arrow is founded. (16. July 1915)

Typhoid Mary, the first healthy carrier of disease ever identified in the United States, is put in quarantine, where she would remain for the rest of her life. (27. March 1915)

World War I: The Second Battle of Champagne begins. (25. September 1915)

World War I: Germany institutes unrestricted submarine warfare. (22. February 1915)

World War I: Italy declares war on Austria-Hungary. (24. May 1915)

World War I: end of First Battle of the Isonzo. (7. July 1915)

Lassen Peak erupts with a powerful force, and is the only mountain other than Mount St. Helens to erupt in the contiguous US during the 20th century. (22. May 1915)

World War I: Massive naval attack in Battle of Gallipoli. Three battleships were sunk during a failed British and French naval attack on the Dardanelles. (18. March 1915)