The Battle of Stallupönen, fought between Russian and German armies on August 17, 1914, was the opening battle of World War I on the Eastern Front. The Germans under the command of Hermann von François conducted a successful counterattack against four Russian infantry divisions from different infantry corps, which heavily outnumbered them but were separated from each other, creating a gap between the 27th Infantry Division and the 40th Infantry Division, and had little coordination with each other. The Germans retreated to Gumbinnen provoking Battle of Gumbinnen.
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. It was arguably the most successful offensive in the entirety of the First World War. The victory contributed to a moral upsurge among the Russian troops, in 1917, Nicholas II planned a general general offensive along the entire front in order to end the Central Powers. After the victory, the Petrograd conference was held at which the post-war structure of the world was discussed.
The Battle of Łódź took place from 11 November to 6 December 1914, near the city of Łódź in Poland. Battles were fought between German units of the Eighth army, Ninth Army, Austrian First Army, and the Russian First, Second, and Fifth Armies, in harsh winter conditions. The Germans redeployed their Ninth Army around Thorn, so as to threaten the Russian northern flank, following German reversals after the Battle of the Vistula River. The German objective was to prevent an invasion of Germany, by encircling and destroying the Russians, as a result, Germans themselves were surrounded and actually lost 2 corps, although the invasion of Germany was prevented Battle had a strong impact on both the Western and Eastern fronts. It ended with the victory of the Russian troops, although the planned invasion of Germany was canceled
The Battle of Galicia was a major battle between Russia and Austria-Hungary during the early stages of World War I in 1914. In the course of the battle, the Austro-Hungarian armies were severely defeated and forced out of Galicia, while the Russians captured Lemberg and, for approximately nine months, ruled Eastern Galicia until their defeat at Gorlice and Tarnów.
The Lake Naroch offensive in 1916 was an unsuccessful Russian offensive on the Eastern Front in World War I. It was launched at the request of Marshal Joseph Joffre and intended to relieve the German pressure on French forces. Due to lack of reconnaissance, Russian artillery support failed to overcome and neutralise the well-fortified German defenses and artillery positions, leading to costly and unproductive direct attacks, hindered by the weather. On 30 March General Evert ordered a halt to the offensive.
Aleksei Ermolaevich Evert was an Imperial Russian general of Orthodox German descent.
The Battle of Limanowa-Łapanów took place from 1 December to 13 December 1914, between the Austro-Hungarian Army and the Russian Army near the town of Limanowa.
Vladimir Ilyich Boyarsky was a Soviet Red Army officer who became a collaborator with Nazi Germany during World War II, serving in Andrey Vlasov's Russian Liberation Army.
The Great Retreat was a strategic withdrawal and evacuation on the Eastern Front of World War I in 1915. The Imperial Russian Army gave up the salient in Galicia and the Polish Congress Kingdom. The Russian Empire's critically under-equipped military suffered great losses in the Central Powers' July–September summer offensive operations, which led to the Stavka ordering a withdrawal to shorten the front lines and avoid the potential encirclement of large Russian forces in the salient. While the withdrawal itself was relatively well-conducted, it was a severe blow to Russian morale.
The 10th Army was a field army of the Imperial Russian Army during the First World War.
Vladimir Vasilyevich Smirnov was an Imperial Russian Army general of the infantry who was a division, corps and field army commander. He fought in the Russian-Turkish War of 1877–1878 and in World War I.
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 Battle of Dniestr and Zolota Lypa was an inconclusive battle between the armies of Austria-Hungary and the Russian Empire during the summer offensive of the Central Powers in 1915.
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 Imperial 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.
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. Further actions for the Germans were extremely unsuccessful, here they suffered heavy losses and did not achieve their goal - to take Dvinsk
The Second Brusilov offensive took place in July–August 1916 on the Eastern Front during the First World War. As a result of the First Brusilov offensive in May–June 1916, the Imperial Russian army defeated the Austro-Hungarian troops and captured a large number of prisoners. But Imperial German army came to the aid of its ally. In July 1916, all Austro-Hungarian troops were subordinated to Paul von Hindenburg and Erich Ludendorff and Hindenburg became commander-in-chief of the entire Eastern Front. The weakest sections of the Austro-Hungarian front were reinforced by German divisions, and most importantly, in the direction of the impending main attack of the Russian Southwestern Front, the defense was mainly occupied by German troops. The offensive in July–August, despite the use of enormous forces and resources by Brusilov, ended in failure. Three Russian armies attacked German positions east of Kovel, but to no avail. The colossal, unprecedented casualties for the Russian Imperial Army are indicated by the numbers of wounded on the Southwestern Front in July–August 1916 - the maximum numbers for the entire war on Eastern Front, exceeding the Russian casualties during the Great Retreat of 1915 under the attacks of the German Imperial Army:
July - 197,069 WIA
August - 172,377 WIA.
Germany 
Austria-Hungary 
Russian Empire 