battle, major, First World War
Second Battle of the Masurian Lakes
Second Battle of the Masurian Lakes was a battle fought on 7 February 1915 at Masurian Lake District, in what is now Russia; it lasted 15 days. It was part of World War I, which ran from 1914 to 1918. The recorded result: German victory.
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Where it sits in World War I
Record
| Date | 7 February 1915 to 22 February 1915 | |
|---|---|---|
| Place | Masurian Lake District, Russia 54.000N, 22.000E | |
| Kind | Battle, First World War | |
| Territorial change | Russian forces evacuate East Prussia | |
| Strength | 250,000 to 275,261; 400 machine guns; 1082 guns | Total: at least 461,364 men; 10th Army: 428,897 men; 355 machine guns; 617 guns; 15th Army Corps; 32,467 men; 64 machine guns; 104 guns; 2nd Army Corps: unknown men |
| Casualties and losses | 20,000 to 31,827 | official Russian medical reports: Total 135,189; (including 80,500 prisoners); 7,402 KIA; 25,946 WIA; 101,841 MIA; Lost: 136 machine guns; 323 guns |
| Commanders |
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The ground today


The recorded site stands at about 0 m; within 10.0 km the ground runs from 0 to 186 m, 186 m of relief, hilly country and today it is 42% tree cover, 31% grassland, 14% cropland.
Elevation from the Copernicus DEM GLO-30 (ESA, Airbus); land cover from ESA WorldCover 2021 (CC BY 4.0), within about 5 km of the recorded site. Computed, not recorded.Nearest engagements
- First Battle of the Masurian Lakes 1914, same recorded site
- Battle of Prostken 1656, 44 km SE
- Battle of Filipów 1656, 45 km NE
- Battle of Rajgród 1831, 55 km SE
- Battle of Białaszewem 1863, 64 km SE
In the same war
- Before: Siege of Mbombwe 25 January 1915
- After: Battle of Vauquois 15 February 1915
- All 161 engagements of World War I
Elsewhere in 1915
- Second Battle of Ypres Belgium
- Gorlice–Tarnów Offensive Poland
- Siege of Van Turkey
- Battles of the Isonzo Slovenia
- Siege of Kut Iraq
Combat data (CDB90)
| Attacker: GER 8TH & 10TH ARMIES | Defender: RUS 10TH ARMY | |
| Strength | 650,000 | 300,000 |
| Casualties | 135,000 (20.8%) | 210,000 (70.0%) |
| Mission accomplishment, 1 to 10 | 8 | 2 |
| Outcome | attacker won | |
| Duration | 2 days | |
| Front width | 209 km | 209 km |
| Attacker advanced | 150 km | |
From the US Army Concepts Analysis Agency Database of Battles (CDB90, battle 294), public domain, in the CC0 tidy edition by Jeffrey B. Arnold. Figures are the database's estimates, compiled in 1990 from published histories, and may differ from the Wikipedia infobox above.
Second Battle of the Masurian Lakes is one of 2,997 engagements of the 20th century in the atlas and one of 350 in present-day Russia.
Sources
Identity, coordinates, dates and the war from Wikidata Q684872, released under CC0. Result, belligerents, commanders, strength and casualties from the infobox of the English Wikipedia article Second Battle of the Masurian Lakes, revision 1385655197, read 2026-11-14, licensed CC BY-SA 4.0; the article's text is not reproduced here. Present-day country and state from Natural Earth. Dates before 1582 follow the Julian calendar as recorded.