According to the terms of their alliance with the rest of Entente, Russian Empire invades Eastern Prussia in force.
Front - Eastern
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1914
17 August1914
14 September
Russian invasion of East Prussia
Military action -
1914
24 August1914
11 September
Battle of Galicia
Military actionOpening engagements in Galicia turn to be unfavourable to the Austro-Hungarian Empire. -
1915
2 May1915
22 June
Gorlice-Tarnow Offensive
Military action -
1916
4 May1916
20 September
Brusilov Offensive
Military action -
1917
4 June1917
25 October
Kerensky Offensive
Military actionDesperately hoping to reunify the Russian Republic around the ongoing war against Central Powers, a great Russian offensive on the Eastern Front begins. -
1918
15 June1918
28 October
Second Battle of the Marne
Military actionThe Kaiserslacht offensive once again reaches the Marne river. The results are catastrophic... and change the world forever. -
1918
28 October1920
11 March
Sitzkrieg
Military actionA temporary period of unofficial armistice, as all sides of the Great War prepare for final confrontation... while desperately trying to reorganize themselves internally to avoid collapsing.Additional timelines
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1920
11 March1920
15 June
Second Kerensky Offensive
Military actionA disastrous attempt by the Russian Republic to retake lost central Poland, and... the reason for Revolution. -
1920
13 May1920
18 May
May Revolution
RevolutionAs The Russian Provisional Government's authority plummeted due to disasters on the front, the Revolution finally happens. -
1920
12 June
Kingdom of Romania annexes Bessarabia
Political event -
1920
23 June1920
23 July
June Armistice
Political eventFollowing the Entente's success in the Hundred Days Offensive, a first attempt to broker peace is made. -
1920
23 July1922
13 April
Second Trench Warfare
Military action -
1921
12 April1921
22 August
Baltic Offensive
Military action -
1924
2 April1924
12 July
Rozwadowski's Northern Offensive
Military action -
1924
22 June
Kingdom of Finland joins Central Powers
Military actionFollowing a brief civil war and a period of armistice, the Kingdom of Finland finally chooses a side.