Question: When was the Brusilov Offensive in eastern Galicia?
About the article "World War I", section "Russian Revolution".

Candidate passages:
At the start of the war Evert was handed command of the Russian Fourth Army based in Galicia in September 1914, replacing General Anton von Saltza.
In August 1915 he was promoted to command Western Army Group.
He participated in the unsuccessful Lake Naroch Offensive and the Brusilov Offensive where he commenced a weak and poorly prepared offensive against the Germans to assist Aleksei Brusilov. 
The General Government of Galicia and Bukovina () was a temporarily Imperial Russian military administration of eastern parts of the Kingdom of Galicia and Lodomeria captured from Austria-Hungary during World War I.
The administration was established after the Russian victory in the Battle of Galicia, led by the commander-in-chief Nikolay Iudovich Ivanov in the late summer of 1914.
It did not last long and by mid-1915 Russians retreated, following the Gorlice–Tarnów Offensive led by the Central Powers overall commander August von Mackensen.
During the later stages of the war, the Russian forces tried to reclaimed the territory during the military operations of Brusilov and Kerensky. 
Brusilov Offensive.
The Italian operations during 1916 had one extraordinarily positive result: Austrian divisions were pulled away from the Russian southern front.
This allowed the Russian forces to organize a counter-offensive.
The Brusilov Offensive was a large tactical assault carried out by Russian forces against Austro-Hungarian forces in Galicia.
General Alexei Brusilov believed victory against the Central Powers was possible if close attention was paid to preparation.
Brusilov suggested that the Russians should attack on a wide front, and to position their trenches a mere seventy-five yard away from Austrian trenches.
Brusilov's plan worked impeccably.
The Russians outnumbered the Austrians 200,000 to 150,000, and held a considerable advantage in guns, with 904 large guns to 600.
The Russian Eight Army overwhelmed the Austrian Fourth and pushed on to Lutsk, advancing forty miles beyond the starting position.
A large number of Austrians were lost, with over 100,000 men killed or taken prisoner by mid-June.
Although the Brusilov Offensive was initially successful, it slowed down considerably.
An inadequate number of troops and poorly maintained supply lines hindered Brusilov's ability to follow up on the initial victories in June.
The Brusilov Offensive is considered to be the greatest Russian victory of the First World War.
Although it cost the Russians a million casualties, the offensive successfully diverted Axis forces from the Western front, and pulled Romania into the war. 
The Brusilov offensive began on June 4, 1916, it was the greatest Russian feat of arms during World War I, and among the most lethal battles in world history.
It was a major offensive against the armies of the Central Powers on the Eastern Front.
Mounting pressure from the western Allies caused the Russians to hurry their preparations.
Brusilov amassed four armies totalling 40 infantry divisions and 15 cavalry divisions.
He faced 39 Austrian infantry divisions and 10 cavalry divisions formed in a row of three defensive lines, although later German reinforcements were brought up.
The breakthrough came when, on June 4, the Russians opened the offensive with a massive, accurate, but brief artillery barrage against the Austro-Hungarian lines.
On June 8, Russian forces of the South-western Front took Lutsk.
By now the Austrians were in full retreat and the Russians had taken over 200,000 prisoners, however Brusilov's forces were becoming overextended.
In a meeting held on the same day Lutsk fell, German Chief of Staff Erich von Falkenhayn persuaded Austrian Field Marshal Franz Conrad von Hötzendorf to redeploy troops from the Italian Front to counter the Russians in Galicia.
General Paul von Hindenburg was again able to capitalize on good railroads to bring German reinforcements east.
At last, on June 18, a weak and poorly prepared offensive commenced under Alexei Evert, and on July 24 Alexander von Linsingen commenced his own counter-attack.
Brusilov and Russian Tsar Nicholas II ordered other Russian commanders to commence their own attacks, however high casualties and internal rivalry meant that this did not occur. 
The Brusilov Offensive ( "Brusilovskiĭ proryv"), also known as the June Advance, was the Russian Empire's greatest feat of arms during World War I, and among the most lethal battles in world history.
Prof. Graydon A. Tunstall of the University of South Florida called the Brusilov Offensive of 1916 the worst crisis of World War I for Austria-Hungary and the Triple Entente's greatest victory.
It was a major offensive against the armies of the Central Powers on the Eastern Front, launched on June 4, 1916, and lasting until late September.
It took place in what today is Ukraine, in the general vicinity of the towns of Lviv, Kovel and Lutsk.
The offensive was named after the Russian commander in charge of the Southwestern Front, Gen. Aleksei Brusilov.