The Brusilov offensive, also known as the "June advance", of June to September 1916 was the Russian Empire's greatest feat of arms during World War I, and among the most lethal offensives in world history. The historian Graydon Tunstall called the Brusilov offensive the worst crisis of World War I for Austria-Hungary and the Triple Entente's greatest victory, but it came at a tremendous loss of life. The heavy casualties eliminated the offensive power of the Imperial Russian Army and contributed to Russia's revolution the next year.
The Second Battle of the Masurian Lakes or Winter Battle of the Masurian Lakes, known in Germany as the Winter Battle in Masuria and in Russia as the Battle of Augustowo, was the northern part of the Central Powers' offensive on the Eastern Front in the winter of 1915 during World War I. The offensive was intended to advance beyond the Vistula River and perhaps knock Russia out of the war. It was the last major battle fought on German soil during World War I.
The First Battle of the Masurian Lakes was a German offensive in the Eastern Front 2–16 September 1914, during the Russian invasion of East Prussia. It took place only days after the Battle of Tannenberg where the German Eighth Army encircled and destroyed the Russian Second Army. Using the rapid movements aided by the East Prussian railway network, the Eighth Army reformed in front of the spread-out Russian First Army and pushed them back across their entire front, eventually ejecting it from Germany. Further progress was hampered by the arrival of the Russian Tenth Army on the Germans' right flank.
The Battle of Humin-Bolimów was an inconclusive battle of World War I fought between January 14 and February 28, 1915 between the Imperial German Army and Russia. The battle is considered a preliminary to the Second Battle of the Masurian Lakes.
The Rovno offensive — the operation of the Austro-Hungarian Northern armies against the armies of the Russian Southwestern Front — the so-called "campaign on Rovno", or Lutsk-Rovno offensive operation. The purpose of the offensive was the liberation of Eastern Galicia, but by the end of the operation, a small part of Eastern Galicia was still held by the Russian Imperial Army.
4th Guards Order of Kutuzov Cavalry Corps was a prominent cavalry formation of the Soviet Red Army which served most notably as part of the Cavalry mechanized group under the command of Guards Lieutenant General Issa Pliyev in operational engagements from Operation Bagration until Battle of Prague when the Great Patriotic War finally came to an end.
Mikhail Mikhailovich Pleshkov was an Imperial Russian Army division and corps commander who achieved the rank of general of the cavalry. After the October Revolution, he fought for the White movement against the Bolsheviks in the Russian Civil War, and after the Bolshevik victory he emigrated to the Republic of China. His son, Mikhail Pleshkov, also served as a general in the White Army in the Russian Far East.
Alexander Alekseyevich Svechin - adjutant general (1880), infantry general (1886) of the Russian imperial army.
The Bug-Narew Offensive from July 13 to August 27, 1915 was a major German victory during World War I on the Eastern Front. The Imperial German Army broke through 4 heavily fortified positions, inflicted defeats on superior enemy forces and pushed the Russian Army 300 km to the east, capturing 215,000 prisoners. But the German army also suffered relatively heavy casualties, about 30,000 killed and missing.
First Battle of Przasnysz was a battle between Imperial German Army and Russian troops which took place between 7–28 February 1915, on the Eastern Front during World War I.
The World War I German Narew offensive followed after the victory in the Second battle of Przasnysz. In stubborn battles, the Imperial German army forced the numerically superior forces of the Russian Army to retreat, but could not inflict a decisive defeat on them.
The offensive of the Russian armies in October 1914 with the aim of capturing East Prussia after in Battle of Augustów (1914).
The Vistula–Bug offensive from July 13 to August 28, 1915, was a major Central Powers offensive with the decisive role of the German Imperial Army during World War I on the Eastern Front to defeat the forces of the Russian army in South Poland and Galicia.
The Riga–Schaulen offensive was a major Imperial German Army's offensive, launched by the Army of the Niemen of Paul von Hindenburg's group of armies to divert Russian forces from the direction of the main German blow of the summer offensive on Narew. However, it gradually changed into an offensive of two German armies to capture the Kovno fortress and reach the Western Dvina. In the course of a successful offensive, the German army defeated the superior forces of the Russian army and reached the approaches to the important city of Riga.
The Battle of Łomża was a series of large-scale battles between the Imperial German and Russian armies in the spring of 1915 on the territory of modern Poland. The Russians were able to repulse the Second German offensive on Przasnysz, but the Imperial German army also repulsed several major offensives of the Russian army.
Summer 1915, Imperial German Army began a Riga–Schaulen offensive and advanced towards Lithuania and Kaunas. The Germans reached Kovno in July 1915. At that time, 66,629 men with 1,370 guns, commanded by Vladimir Grigoriev, manned the fortress. To attack the fortress, the Germans brought four divisions to the operation, which were placed under the command of Karl Litzmann.
The Second battle of Przasnysz took place at the beginning of a major Bug-Narew Offensive of the Imperial German army on the German Eastern front. In the course of a stubborn battle, German troops under the command of Max von Gallwitz broke into the heavily fortified defenses of the outnumbered Russian army and took the city of Przasnysz.
The 9th German Army acted versus the Russian armies west of the Vistula River. After the completion of the fighting at Humin and Wola Szydłowska, there was some calm in this sector, especially before the Russian 2nd Army. But, having received the task of pinning down the Russian troops here, the commander of the German 9th Army, General of the Cavalry August von Mackensen, decided by going on the offensive not only to help the Austro-Hungarian troops in the Carpathians, but, if successful, push back Russian 5th Army to Warsaw.
First Riga offensive was a military operation of the German Imperial Army with to divert Russian forces from the direction of the main blow of the German summer offensive on Narew River. The Germans broke through the heavily fortified defenses of the Russian army and defeated the vastly superior enemy forces. However, no decisive success was achieved, and at the beginning of August the Russians launched a counteroffensive.
The Vilno-Dvinsk offensive took place in the autumn of 1915 between the cities of Vilno and Dvinsk. It was strategic withdrawal by Russian forces on the Eastern Front of World War I, after a successful summer German offensive. The German armies were under the command of Supreme Commander of All German Forces in the East, Field Marshal Paul von Hindenburg. Although weakened by the transfer of 12 divisions to France and the Balkans, as part of taking a defense, Hindenburg had his forces conduct several secondary offensive operations. However, the numerical superiority of the Russians did not allow Hindenburg to achieve a lasting success.
German Empire 
Russian Empire 
Hermann von Eichhorn