Question: When did the Russian armies withdraw from the Caucasus front?
About the article "World War I", section "New states under war zone".

Candidate passages:
 Caucasus Front (Russian Republic), the successor organization to the Imperial Russian Caucasus Army  
At the beginning of World War I Yudenich was appointed Chief of Staff of the Russian Caucasus Army.
The detachment's operations included the Battle of Sarıkamış, a victory against Enver Pasha of the Ottoman Empire.
In January 1915, Yudenich was promoted to General of Infantry, and replaced Count Illarion Ivanovich Vorontsov-Dashkov as commander of the Caucasus Campaign.
Yudenich tried to exploit the Turkish defeat by attacking into Turkish territory, specifically around Lake Van during the Siege of Van.
While the Russians did capture Van in May 1915, they were forced to withdraw from the city two months later.
The Ottoman 3rd Army re-occupied Van in August.
At this time, Grand Duke Nicholas, having been removed from command of all of Russia's armies, was put in charge of the Caucasus region.
Yudenich was given a free hand by the Grand Duke and, in September, the Russians retook Van and re-established the Administration for Western Armenia in June 1916.
Fighting back and forth around this region continued for the next 14 months without a clear victory for either side.
In 1916 Yudenich successfully carried out an offensive, winning the Battle of Erzurum (1916) and the Trebizond Campaign.
In the summer of that year, his forces fought off a Turkish counter-attack culminating in the Battle of Erzincan (despite the presence of Turkish General Mustapha Kemal).
During this battle, Yudenich was awarded the Order of St. George (2nd degree), the final time this decoration was awarded in the Russian Empire.
Following the February Revolution, in 1917 Yudenich was appointed commander of the Caucasus Front, but in May the Russian Provisional Government removed him from command for insubordination, and on the direct orders from Alexander Kerensky, he retired from the army.
Yudenich then relocated from Tbilisi to Petrograd, where he supported the Kornilov Revolt. 
With the dissolution of the Russian Empire in the wake of the Feb 1917 revolution and of the Transcaucasian Federation in May 1918, the Armenians of the South Caucasus declared their independence and formally established the First Republic of Armenia.
In its two years of existence, the tiny republic, with its capital in Yerevan, was beset with a number of debilitating problems, ranging from fierce territorial disputes with its neighbors and an appalling refugee crisis.
Armenia's most crippling problem was its dispute with its neighbor to the west, the Ottoman Empire.
The Ottomans had killed as many as a million Armenians and weakened the country during the Armenian Genocide.
Although the armies of the Ottoman Empire eventually occupied the South Caucasus in the summer of 1918 and stood poised to crush the republic, Armenia resisted until the end of October, when the Ottoman Empire capitulated to the Allied powers.
Though the Ottoman Empire was partially occupied by the Allies, they did not withdraw their forces from the pre-war Russo-Turkish boundary until February 1919 and maintained many troops mobilized along this frontier. 
 Russian Caucasus Forces (before 1865), a variety of formations with various names including (in 1857-1865) Caucasus Army  Caucasus Military District, the successor organization to this army Russian Caucasus Army (World War I), the Russian army on the Caucasus front in World War I (July 1914 - April 1917)  
The Caucasus Army was formed in July 1914 from units of the Caucasus Military District.
It ceased to exist in April 1917 when it was reorganized as the Caucasus Front, although this Front contained many of the same units and continued fighting in the same theater.
This Front in turn formally ceased to exist in March 1918.