At the outset of the Soviet invasion of Poland (17 September 1939), the Soviets declared that the Polish state and government—as a result of the German invasion of Poland that began on 1 September 1939—no longer existed and proclaimed any treaty or diplomatic relations between the Soviet Union and Poland invalid.[2] Diplomatic relations were re-established in 1941 after the German invasion of the Soviet Union, when the British government allied itself with the attacked Soviet Union and pressured the Polish government to act accordingly. Consequently, the military agreement of 14 August and the Sikorski–Mayski agreement of 17 August, between the Polish government-in-exile and the Soviet government, were signed; Joseph Stalin agreed to abrogate the Poland-related aspects of the Molotov–Ribbentrop Pact.[3] As an amnesty for Polish citizens in the Soviet Union was negotiated, tens of thousands of Polish prisoners of war held in Soviet camps, as well as hundreds of thousands of Polish citizens who had been deported to the USSR, were released.
Polish Prime Minister, General Władysław Sikorski, nominated General Władysław Anders—one of the Polish officers held captive in the Soviet Union—as commander of a new Polish army which immediately began to be formed in the USSR with the aim of fighting against the Germans alongside the Soviet Red Army.
The new formation became known as Anders' Army and started to organise in the Buzuluk area, by recruiting from NKVD camps for Polish POWs. By the end of 1941, 25,000 soldiers (including 1,000 officers) had been recruited, forming three infantrydivisions: the 5th, 6th and 7th. In the spring of 1942, the force was moved to the area of Tashkent. The 8th and 9th divisions were also formed that year (divisions numbered 5 to 9 existed both within Anders' Army and Berling's First (1,2,3,4,6) and Second Armies (5,7,8,9,10).
After Anders' Army left Soviet controlled territory, the Soviet-Polish relations deteriorated and the Soviets decided to assume much greater control over the remaining Polish military potential in the USSR. Activities of organisations and people loyal to the Polish government-in-exile, particularly the Polish embassy in Moscow, were curtailed and its assets confiscated. Diplomatic relations between the Soviet Union and the Polish government were suspended by the Soviet side as news of the Katyn massacre emerged in 1943.[citation needed]
In June 1943, the Union of Polish Patriots (ZPP) was founded in Moscow. The ZPP was a mass-membership, communist-led organization for Polish citizens. It conducted political activities and organized large-scale social welfare and relief programs for Polish communities in the Soviet Union. The ZPP was led by the pro-Soviet Polish communistWanda Wasilewska.
At the same time, due to the efforts of Wasilewska and Zygmunt Berling, a new army was established—the Polish People's Army (Ludowe Wojsko Polskie, LWP). Its first unit, the Polish 1st Tadeusz Kościuszko Infantry Division (1 Dywizja Piechoty im. Tadeusza Kościuszki), was created in the summer of 1943, reaching operational readiness by June/July. In August, the division was enlarged to a corps, becoming the Polish 1st Corps. It was placed under command of General Berling; other notable commanders included General Karol Świerczewski and Col. Włodzimierz Sokorski. The division with its supporting elements was sent to the Eastern Front in September 1943 and its first major engagement was the Battle of Lenino. By March 1944, the corps had been strengthened with increasing armoured and mechanical support and numbered over 30,000 soldiers. In mid-March 1944, the corps was reorganized into the First Polish Army.
Subsequent Soviet-created Polish army units on the Eastern Front included the Second (1945) and Third Polish Armies (the latter was quickly merged with the Second due to recruitment problems); the smaller formations included 10 infantry divisions (numbered from 1st to 10th) and 5 armoured brigades. Plans for a Polish Front were considered but dropped, and the Polish First Army was integrated into the 1st Belorussian Front.
These formations were led by Soviet commanders and fought under Soviet general command (the Second Army, for example, was led by the Soviet and Polish general Stanislav Poplavsky). There was a shortage of Polish officers (most were killed at Katyn or departed with Anders' Army) and in the Polish First Army and the Second Army approximately 40% of officers and engineers were Soviet. Special political officers, almost exclusively made up of Soviets, oversaw the Polish soldiers. The Soviets also created political military police, which later became the Main Directorate of Information of the Polish Army (Główny Zarząd Informacji Wojska Polskiego).[4]
The First Army entered Poland from Soviet territory in the summer of 1944, on the right wing of the Lvov–Sandomierz Offensive, fighting in the battles during the Soviet crossing of the Vistula River around Dęblin and Puławy.[5] In September 1944, units of the First Army were involved in heavy fighting during the latter stages of the Warsaw Uprising, after crossing the Vistula following the capture of Warsaw's eastern Praga district, but suffered heavy losses.
After eventually taking control of Warsaw in January 1945, the First Army took part in the Vistula–Oder Offensive. Subsequently, it fought in Pomerania, breaking through the Pomeranian Wall (Pommernstellung) fortified line and capturing Fortress Kolberg, a heavily fortified city, in March. In April–May 1945, the First Army took part in the Soviet invasion of Germany and the final capture of Berlin.
The Second Army reached operational readiness in January 1945. During the Soviet invasion of Germany it suffered very heavy losses at the Battle of Bautzen. Later it took part in the Prague Offensive, which was the last major Soviet operation of World War II in Europe.
^René Lefeber, Malgosia Fitzmaurice, The Changing Political Structure of Europe: aspects of International law, Martinus Nijhoff Publishers, ISBN0-7923-1379-8, Google Print, p.101
