7 May

1915 (Friday)

 * Libau (Baltic Provinces) taken by German forces (see 30 April).
 * Russians fall back to the River Vistock, and retreat in the Carpathians.
 * Massacres of Christians in Ottoman Empire.
 * British Foreign Minister Sir Edward Grey sends a message to the Ottoman Government as to the placing of allied citizens in the danger zone.
 * Sir Edward Grey gives conditional guarantee to Serbian Minister of eventual cession of Bosnia and Herzegovina with "wide access to the Adriatic" (see 15 and 30 August).
 * RMS Lusitania is torpedoed by SMU U-20 off the south-west coast of Ireland: 1,198 men, women and children drowned, including 124 US citizens (see 6 February).
 * Japan presents an ultimatum to China demanding territorial concession (see 9 May).