When did the USSR invade Poland?
September 17th 1939
September 1939
1 September 1939
1939
September 1939
1939
17 September 1939
September 1939
1939
September 17, 1939
1939
September 1939
1939
22 September 1939
September 1939
1 September 1939
1939
September 11, 1939
September 1, 1939
September 17
3 September 1939
1939
September 1939
September 17
1939
September 17, 1939
Invasion of Poland
17 September 1939
September 17
1 September 1939.
September 1939
1939
Invasion of Poland
September 17
1939
September 1939.
September 1939
September 17
1 September 1939
September 11, 1939
September 1, 1939
1939
Invasion of Poland
22 September 1939
September 1939.
September 17
September 1939
1939
17 September 1939.
September 17, 1939
September 17
Invasion of Poland
1939
September 1939.
September 17, 1939.
1939.
17 September 1939
September 1939
September 17
1939
1939.
September 1, 1939.
September 1939.
September 11, 1939.
September 17
September 1939
1939
September 11, 1939
September 1, 1939
1 September 1939.
3 September 1939.
1939.
22 September 1939.
1 September 1939
September 17
22 September 1939
1939
September 1939.
September 1939
September 17, 1939
1939.
September 17
1939
September 1939.
September 1739
September 17
1939.
September 1
September 1939
1939
17 September 1939
September 17 and 1939
17 September 1939.
September 17
September 1
September 17, 1939.
1939.
1939
September 1939.
September 1739
September 11, 1939
September 1, 1939
September 1939
September 17 and 1939
September 17
September 1
1939
1939.
Invasion Poland
September 1, 1939.
September 17 – 1940
1 September 1939.
1 September 1939
September 1939
September 1939.
September 1739
22 September 1939
September 17
September 17, 1939
September 1
September 17 and 1939
1939.
Invasion Poland
September 17 and October 17
September 17 – 1940
September 1939
September 17
September 1
1940
September 1939.
September 1739
September 17 and 1939
1939.
Invasion Poland
1940
September 17
September 17 – 1940
September 1939
September 1
17 September 1939
September 17 and October 17
September 17th 1939
September 1939 –
17-September 1939
1940
1939.
September 11, 1939
September 1, 1939
September 1939.
September 1739
Invasion Poland
September 17
September 1
September 1939 -
September 1939
September 17 and 1939
September 17 – 1940
September 17 and October 22
1940
1 September 1939
September 17, 1939
1939.
1 September 1939.
September 17 and September 18
September 17
September 17 – 17
September 1
1940
1939-41
September 1939
September 1939.
September 1739
September 17 and 1939
September 17 and October 22
September 17 and October 17
1940
1939.
September 17
17-August 1939
September 17 – 17
1939-41
September 1939
September 22
September 1
1940
September 17 and 1939
September 1939.
September 1739
September 17 and October 17
1939.
17-September-39
17-September-1939
17-August-1939
17-August-39
1940
Invasion Of Poland
September 17 – 17
September 1
September 1939,
1939-41
September 17 and September 18