World War I: Russia launches an offensive against Austria-Hungary to capture Galicia, its final offensive of the war.

World War I or the First World War, also known as the Great War, was a global conflict between two coalitions: the Allies and the Central Powers. Main areas of conflict included Europe and the Middle East, as well as parts of Africa and the Asia-Pacific. There were important developments in weaponry including tanks, aircraft, artillery, machine guns, and chemical weapons. One of the deadliest conflicts in history, it resulted in an estimated 30 million military casualties, plus another 8 million civilian deaths from war-related causes and genocide. The movement of large numbers of people was a major factor in the deadly Spanish flu pandemic.

The Kerensky offensive, also called the summer offensive, the June offensive in Russia, or the July offensive in Western historiography, took place from 1 July [O.S. 18 June] to 19 July [O.S. 6 July] 1917 and was the last Russian offensive of World War I. After the abdication of Emperor Nicholas II during the February Revolution, the Russian Provisional Government pledged to fulfill Russia's existing commitments to the Triple Entente, which included launching an offensive in the spring of 1917. The operation was directed at capturing Lemberg and the rest of Galicia from Austria-Hungary.

Austria-Hungary, also referred to as the Austro-Hungarian Empire, the Dual Monarchy or the Habsburg Monarchy, was a multi-national constitutional monarchy in Central Europe between 1867 and 1918. A military and diplomatic alliance, it consisted of two sovereign states with a single monarch who was titled both the Emperor of Austria and the King of Hungary. Austria-Hungary constituted the last phase in the constitutional evolution of the Habsburg monarchy: it was formed with the Austro-Hungarian Compromise of 1867 in the aftermath of the Austro-Prussian War, following wars of independence by Hungary in opposition to Habsburg rule. It was dissolved shortly after Hungary terminated the union with Austria in 1918 at the end of World War I.