HMHS Salta during WWI. Image courtesy United Kingdom Government.
- Bulgaria severs diplomatic relations with the United States of America
- The British hospital ship HMHS Salta hits mine laid by the German U-boat UC-26 in the English Channel off Havre. The Salta sinks in under ten minutes; of the 205 people aboard, nine nurses, 42 members of the Royal Army Medical Corps and 79 crew drown.
- French troops on the Western Front commence the great bombardment of Moronvilliers massif hills east of Reims
