The most important military operations on the Eastern and Western Fronts of the First World War.

Western Front:
1. German invasion of Belgium, the rapid advance of German troops to Paris;
2. Battle of the Marne;
3. Battle of Verdun in 1916;
4. Battle of the Somme;
5. Battle of the Marne (1917).
Eastern front:
1. At the beginning, the successful offensive of the two Russian armies of Samsonov and Rennenkampf ended in defeat;
2. Galician operation, advance of Russian units to Lvov;
3. Large-scale retreat of the Russian armies in 1915, loss of significant territories, stabilization of the front;
4. Brusilov breakthrough in 1916.