Invasion of Poland . Behind him: Ribbentrop and Stalin. On 1 September 1939, the
invasion of Poland by
Nazi Germany began. Consequently, Britain and France, fulfilling the
Anglo-Polish and
Franco-Polish treaties of alliance, declared war on Germany. Despite these declarations of war, the two nations undertook minimal military activity during what became known as the
Phoney War. The
Soviet invasion of Poland began on 17 September, in accordance with the
Molotov–Ribbentrop Pact. The
Red Army advanced quickly and met little resistance, as Polish forces facing them were under orders not to engage the Soviets. About 250,000 to 454,700 Polish soldiers and policemen were captured and interned by the Soviet authorities. Most were freed or escaped quickly, but 125,000 were imprisoned in camps run by the
NKVD. Of these, 42,400 soldiers, mostly of Ukrainian and Belarusian ethnicity serving in the Polish Army, who lived in the
territories of Poland annexed by the Soviet Union, were released in October. The 43,000 soldiers born in western Poland, then under Nazi control, were transferred to the Germans; in turn, the Soviets received 13,575 Polish prisoners from the Germans.
Polish prisoners of war Soviet repressions of Polish citizens occurred as well over this period. Since Poland's
conscription system required every nonexempt university graduate to become a military reserve officer, the NKVD was able to round up a significant portion of the Polish educated class as prisoners of war. According to estimates by the
Institute of National Remembrance (IPN), roughly 320,000 Polish citizens were
deported to the Soviet Union (this figure is questioned by other historians, who hold to older estimates of about 700,000–1,000,000). IPN estimates the number of Polish citizens who died under Soviet rule during World War II at 150,000 (a revision of older estimates of up to 500,000). Of the group of 12,000 Poles sent to
Dalstroy camp (near
Kolyma) in 1940–1941, mostly POWs, only 583 men survived; they were released in 1942 to join the
Polish Armed Forces in the East. According to
Tadeusz Piotrowski, "during the war and after 1944, 570,387 Polish citizens had been subjected to some form of
Soviet political repression". As early as 19 September 1939, the head of the NKVD,
Lavrentiy Beria, ordered the secret police to create the
Main Administration for Affairs of Prisoners of War and Internees to manage Polish prisoners. The NKVD took custody of Polish prisoners from the Red Army, and proceeded to organise a network of reception centres and transit camps, and to arrange rail transport to prisoner-of-war camps in the western USSR. The largest camps were at
Kozelsk (
Optina Monastery), Ostashkov (
Stolobny Island on
Lake Seliger near Ostashkov), and
Starobilsk. Other camps were at Jukhnovo (rail station
Babynino), Yuzhe (Talitsy), rail station
Tyotkino ( from
Putyvl),
Kozelshchyna, Oranki,
Vologda (rail station
Zaonikeevo), and
Gryazovets. during the
Soviet invasion of Poland Kozelsk and Starobelsk were used mainly for military officers, while Ostashkov was used mainly for
Polish Scouting,
gendarmes, police officers, and prison officers. Some prisoners were members of other groups of Polish intelligentsia, such as priests, landowners, and law personnel. The approximate distribution of men throughout the camps was as follows: Kozelsk, 5,000; Ostashkov, 6,570; and Starobelsk, 4,000. They totalled 15,570 men. According to a report from 19 November 1939, the NKVD had about 40,000 Polish POWs: 8,000–8,500 officers and warrant officers, 6,000–6,500 officers of police, and 25,000 soldiers and non-commissioned officers who were still being held as POWs. In December, a wave of arrests resulted in the imprisonment of additional Polish officers.
Ivan Serov reported to Lavrentiy Beria on 3 December that "in all, 1,057 former officers of the Polish Army had been arrested". The 25,000 soldiers and non-commissioned officers were assigned to
forced labor (road construction, heavy metallurgy).
Preparations Once at the camps, from October 1939 to February 1940, the Poles were subjected to lengthy interrogations and constant political pressure by NKVD officers, such as
Vasily Zarubin. The prisoners assumed they would be released soon, but the interviews were in effect a selection process to determine who would live and who would die. According to NKVD reports, if a prisoner could not be induced to adopt a pro-Soviet attitude, he was declared a "hardened and uncompromising enemy of Soviet authority". On 5 March 1940, pursuant to a note to Stalin from Beria, six members of the
Soviet Politburo Stalin,
Vyacheslav Molotov,
Lazar Kaganovich,
Kliment Voroshilov,
Anastas Mikoyan, and
Mikhail Kalinin signed an order to execute 25,700 Polish "nationalists and counterrevolutionaries" kept at camps and prisons in occupied western Ukraine and Belarus. The reason for the massacre, according to the historian
Gerhard Weinberg, was that Stalin wanted to deprive a potential future Polish military of a large portion of its talent. The Soviet leadership, and Stalin in particular, viewed the Polish prisoners as a "problem" as they might resist being under Soviet rule. Therefore, they decided the prisoners inside the "special camps" were to be shot as "avowed enemies of Soviet authority". == Executions ==