The North Russia Intervention, also known as the Northern Russian Expedition, was part of the Allied Intervention in Russia after the October Revolution

October Revolution

The October Revolution , also known as the Great October Socialist Revolution , Red October, the October Uprising or the Bolshevik Revolution, was a political revolution and a part of the Russian Revolution of 1917...

. The intervention brought about the involvement of foreign troops in the Russian Civil War

Russian Civil War

The Russian Civil War was a multi-party war that occurred within the former Russian Empire after the Russian provisional government collapsed to the Soviets, under the domination of the Bolshevik party. Soviet forces first assumed power in Petrograd The Russian Civil War (1917–1923) was a...

 on the side of the White movement

White movement

The White movement and its military arm the White Army - known as the White Guard or the Whites - was a loose confederation of Anti-Communist forces.The movement comprised one of the politico-military Russian forces who fought...

. The northern campaign lasted from the final months of World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 in 1918 through to 1919.
In March 1917, a number of events occurred which changed the dynamics of World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

.