Front was the term used by the Russian Empire

Russian Empire

The Russian Empire was a state that existed from 1721 until the Russian Revolution of 1917. It was the successor to the Tsardom of Russia and the predecessor of the Soviet Union...

 during the First World War for the largest fighting formation. The term was also later used by the Red Army

Red Army

The Workers' and Peasants' Red Army started out as the Soviet Union's revolutionary communist combat groups during the Russian Civil War of 1918-1922. It grew into the national army of the Soviet Union. By the 1930s the Red Army was among the largest armies in history.The "Red Army" name refers to...

 (see Front (Soviet Army)

Front (Soviet Army)

A front was a major military organization in the Soviet Army during many wars. It was roughly equivalent to an army group in the militaries of most other countries except Germany...

.

After the outbreak of the First World War, the Russian General Headquarters

Stavka

Stavka was the term used to refer to a command element of the armed forces from the time of the Kievan Rus′, more formally during the history of Imperial Russia as administrative staff and General Headquarters during late 19th Century Imperial Russian armed forces and those of the Soviet Union...

 set up two Fronts: Northwestern Front

Northwestern Front (Russian Empire)

The Northwestern Front was a military formation of the Imperial Russian Army during the First World War.It was established in August 1914. In August 1915 it was split into Northern Front and Western Front....

 uniting forces deployed against German Empire

German Empire

The German Empire refers to Germany during the "Second Reich" period from the unification of Germany and proclamation of Wilhelm I as German Emperor on 18 January 1871, to 1918, when it became a federal republic after defeat in World War I and the abdication of the Emperor, Wilhelm II.The German...

 and Southwestern Front

Southwestern Front (Russian Empire)

The Southwestern Front was a major unit of the Imperial Russian Army during the First World War. It was established on 19 August 1914.- Commanders of the Southwestern Front :* 19.07.1914-17.03.1916 — General of Infantry Nikolai Ivanov...

, uniting forces deployed against Austria-Hungary

Austria-Hungary

Austria-Hungary , more formally known as the Kingdoms and Lands Represented in the Imperial Council and the Lands of the Holy Hungarian Crown of Saint Stephen, was a constitutional monarchic union between the crowns of the Austrian Empire and the Kingdom of Hungary in...

.

In August 1915, Northwestern front was split into Northern Front

Northern Front (Russian Empire)

The Northern Front was a major unit of the Imperial Russian Army during the First World War.-Composition:*1st Army *5th Army *6th Army The Northern Front was a major unit of the Imperial Russian Army during the First World War.-Composition:*1st Army (April 1916 - July 1917, Sept. 1917 - early...

 and Western Front

Western Front (Russian Empire)

The Western Front was a major unit of the Imperial Russian Army during the First World War. It was formed on the base of the Northwestern Front and disbanded in 1918.-Composition:Field Office * 1st Army...

.

At the end of 1916 Romanian Front

Romanian Front (Russian Empire)

The Romanian Front was a formation of the Imperial Russian Army during the First World War.-Commanders:* 12.12.1916—01.04.1917 — General of Cavalry Vladimir Viktorovich Sakharov* 11.04.1917—25.03.1918 — General of Infantry Dmitry Shcherbachev...

 was established, which also included remnants of the Romanian army.

In April 1917, Caucasus Front was established by the reorganization of the Caucasus Army.