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7 September 1939
Soviet Union
Western military districts begin mobilization

17 September 1939
Poland
Soviet forces cross into Poland

3rd Army of Soviet Byelorussian Front attacking toward Postawy

11th Army of Soviet Byelorussian Front attacking toward Vilno

10th Army of Soviet Byelorussian Front attacking toward Lida

4th Army, commanded by General Vasili Chuikov, of Soviet Byelorussian Front attacking toward Baranowicze

5th Army of Soviet Ukrainian Front attacking toward Sarne and Rowne

6th Army of Soviet Ukrainian Front attacking toward Tarnopol

12th Army of Soviet Ukrainian Front attacking toward Stanislavov

18 September 1939
Poland
Armies of Soviet Byelorussian Front and Ukrainian Front advance through eastern Poland against minimal resistance, in some cases welcomed under mistaken belief they are deploying to fight German forces

Soviet 11th Army attacking border guards and local volunteers in Vilno as Polish forces withdraw from the city

Soviet 5th Army attacking Polish border guards, supported by armored train Bartosz Glowacki, in fortifications around Sarne

20 September 1939
Poland
Soviet forces unsuccessfully attacking Grodno

Soviet forces unsuccessfully attacking around Lvov overnight

21 September 1939
Poland
Soviet forces capture Grodno

Soviets attacking Polish 3rd Border Guard Regiment around Borowicze-Hruziatyn-Nawoz

Soviet forces massing around Lvov

22 September 1939
Poland
Soviet forces attack Polish 101st Reserve Cavalry Regiment around Kodziowce overnight, pushing Polish troops across border into Lithuania

Soviets attacking Polish 3rd Border Guard Regiment around Borowicze-Hruziatyn-Nawoz

Polish garrison of Lvov surrenders to Marshal Timoshenko's Ukrainian Front

German forces hand over Brest-Litovsk to Soviets

26 September 1939
Poland
Remnants of Polish forces near Bilgoraj surrender to Soviets

27 September 1939
Poland
Remnants of Polish force south of Przemysl under General Anders surrender to Soviets

2 October 1939
Poland
Remnants of Polish forces near Nisko surrender to Soviets



War Diary records on file for this subject: 24 

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