The Germans, using poison gases, inflicted heavy losses on the Russian troops, but could not use the success and limited themselves to minimal acquisitions.

In the spring of 1915, The German command, together with the actions of the southern group, planned to attack Warsaw, as it was in December 1914 during the Battle of the Four Rivers.

In general, the operational situation that developed in this sector of the front fully corresponded to the strategic plan of the command of the 9th German Army, to conduct a decisive attack on Warsaw here.

However, despite all the obvious tactical and operational benefits, it was extremely difficult for German troops to make a breakthrough in the Bolimów sector, because the Russian command, understanding the threat of a breakthrough in this direction, saturated this section of the front with troops, and also during the winter and spring 1915 created and continued to create fortified positions throughout the entire depth of the operational defense, which extended far to the east and ended at Błonie, 15-20 kilometers and at Piaseczno, 5-8 kilometers west and southwest of Warsaw.

[5] Based on the established concept of the planned operation, at the beginning of May 1915, the German command transferred the 36th Pioneer Regiment to positions near Bolimov.

[8] The cylinders were placed on a 12-kilometer section of the front in the trenches of the 36th, 35th Infantry and 49th Reserve Divisions of the German Imperial Army, which occupied positions from the confluence of the Sukha River into the Bzura River in the north, where the village of Zakrzew was located, and further south along broken line: Zakrzew – Borzymów – Gumin – Wola Szydłowiecka – forester's house.

[11] At 3:30 a.m. on May 31, 1915, in the German frontline trenches, in which there were 12,000 cylinders of lethal gas, the telephone rang and a voice was heard on the receiver that said only one word: “Wittelsbach”.

Although the Russian units suffered critical losses from chlorine poisoning, they still managed, with the help of arriving reserves, to repel numerous German attacks.

Not even a single minimal tactical task was completed, and progress since the beginning of the fighting went rather in a negative direction, soon the Germans tried to repeat the offensive.

Preparations were reduced as Russian troops launched nightly attacks to recapture lost sections of the position, but the number of heavy batteries increased to 24.

[15] Despite this, the German command was extremely dissatisfied with the result of the attacks, despite some tactical success, not a Single unit completed its tasks and the Russian defense was still impregnable.

On July 6, the gases were launched only at Borzhimov; the wind changed from east to north, and the gas cloud not only lingered in the trenches captured by the Germans, but also penetrated the positions of the 5th reserve division, forcing it to retreat to Zakrzhev.

[20] In this attack, Her Majesty Alexandra Feodorovna's 21st Siberian Regiment distinguished itself the most, which was one of the first to be gassed and even so continued to resist, defending the advanced positions.

[20] Even though the Russians suffered very heavy losses, german troops made only minor progress, not completing the tasks set.

[23] General Falkenhayn was forced to state that operations against the Warsaw salient were not producing the desired result and that the German advance was difficult due to fierce resistance on their way.

[25] According to calculations by Sergei Nelipovich and Nikolai Postnikov Russian troops lost 46,310 people, of whom 5,196[a] died, 4,603 were missing and 36,511[b] were injured.

The head of the “Commission to clarify the conditions of the use of asphyxiating gases by the Germans on the night of June 23–24 of this year in the area where the 5th Siberian and 35th Army Corps were located and the results of their use,” Major General Pavlov wrote:[28] I consider it my duty to report that the highest The commanding staff of the 5th Siberian Corps and the 35th Army Corps verbally and in written explanations, as well as all the officers of the 21st Siberian Rifle and 218th Gorbatov Infantry Regiments, expressed to me and the members of the commission in the most categorical form that: After that, a commission was established to combat toxic substances in order to minimize damage from such actions by the German army.