Soviet invasion of Poland facts for kids

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Soviet invasion of Poland
Part of the invasion of Poland in World War II
Soviet forces marching through Poland in 1939
Soviet forces marching through Poland in 1939.
Date 17 September – 6 October 1939
Location Poland
Result Decisive Soviet victory
Territorial
changes
Polish territory divided and annexed
Participants
Flag of Poland.svg Poland  Soviet Union
Commanders and leaders
Flag of Poland.svg Edward Rydz-Śmigły Soviet Union Kliment Voroshilov (Commander-in-Chief)
Soviet Union Mikhail Kovalyov (Belarusian Front)
Soviet Union Semyon Timoshenko (Ukrainian Front)
Strength
20,000 Border Protection Corps,

250,000 Polish Army.
466,516–800,000 troops


33+ divisions
11+ brigades
4,959 guns
4,736 tanks
3,300 aircraft

Casualties and losses
3,000–7,000 dead or missing,


up to 20,000 wounded.

1,475–3,000 killed or missing
2,383–10,000 wounded.

The 1939 Soviet invasion of Poland was a Soviet military operation that started without a formal declaration of war on 17 September 1939. It was during the early stages of World War II. Sixteen days after Nazi Germany invaded Poland from the west, the Soviet Union did so from the east. The invasion ended on 6 October 1939. Germany and the Soviet union divided the whole of the Second Polish Republic.

In early 1939, the Soviet Union asked the United Kingdom, France, Poland, and Romania to make an alliance against Nazi Germany. The Soviet Union wanted Poland and Romania to let Soviet troops go through their territory. Poland and Romania both said no. The Soviet Union made a secret deal with Nazi Germany on 23 August. They planned to divide Northern and Eastern Europe into German and Soviet lands. One week later, German forces invaded Poland from the north, south, and west. Polish forces then withdrew to the southeast to wait for French and British support. The Soviet Red Army invaded the Kresy on 17 September. The Soviet government said it was acting to protect the Ukrainians and Belarusians. They lived in the eastern part of Poland.

The Soviet government added the land they won. In November 1939 they made the 13.5 million formerly Polish citizens become citizens of the Soviet Union. They sent hundreds of thousands of people from this region to Siberia and other remote parts of the Soviet Union.

Soviet forces stayed in eastern Poland until the summer of 1941. They were moved by the invading German army in the course of Operation Barbarossa. The area was under Nazi occupation until the Red Army reconquered it in the summer of 1944. An agreement at the Yalta Conference let the Soviet Union add almost all of their part of the Second Polish Republic. The People's Republic of Poland got the southern half of East Prussia and lands east of the Oder-Neisse Line. The Soviet Union added the lands into the Ukrainian Soviet Socialist Republic and the Byelorussian Soviet Socialist Republic.

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