On the night of 3–4 January 1944 the advancing
Red Army crossed the former eastern border of the
Second Polish Republic in the area of
Volhynia (near the village of Rokitno). In several months, they pushed the
Wehrmacht further west, reaching the line of the
Vistula river on 24 July 1944. The Soviet advance stopped short of
Warsaw, while the
Armia Krajowa attempted to liberate the Polish capital from
the Nazis ahead of the Red Army's offensive. The
Warsaw Uprising by forces loyal to the
Polish government-in-exile in London was crushed after 63 days. On 22 July 1944, acting upon orders from
Moscow, the Polish communists who arrived in the eastern town of
Chełm created a
pro-Soviet Committee, which became the
Provisional Government of the Republic of Poland after re-locating to
Lublin. After moving to Warsaw in January 1945, and with full political control by Stalin and Soviet sponsorship, the communists abandoned the
parliamentary system of prewar Poland and ignored the wishes of the Polish people, basing their new government's power solely on the Red Army's occupation of the country. Meanwhile, acting together under the command of Soviet General
Ivan Serov, the forces of the
NKVD,
SMERSH and the
Polish communist secret service (UB), which was modelled on the Soviet secret police, On 15 October 1944,
Lavrentiy Beria signed
Order No. 0012266/44, which established NKVD Division 64, whose only task was to fight against the Polish resistance. Tens of thousands of Polish partisans were deported to
Siberia. Many members of the Polish underground were given the choice between a lengthy prison sentence, and service in the Soviet-run
Polish Armed Forces in the East. Faced with an unacceptable choice, and knowing about the grave fate of their own leaders (see:
Trial of the Sixteen), thousands of soldiers of the Home Army (which was officially disbanded on 19 January 1945) and other organizations decided to continue fighting for freedom after the
end of World War II. == Polish anti-communist Insurrection ==