Initially the Soviet partisan groups were formed primarily in the areas of
Nowogródek (modern Navahrudak),
Lida and
Wilno (modern Vilnius) from
Red Army soldiers who evaded capture by the advancing German forces. Lacking support from the local population, the Soviet partisan groups retreated to various large forest complexes in the area, where they hid from the German rear and anti-partisan units. There were also Soviet-affiliated and controlled groups, namely
Gwardia Ludowa, later transformed into
Armia Ludowa, which while often described as parts of the Polish resistance, were de facto controlled by Soviets, and as such can also be seen as extensions of the Soviet partisans. By the end of July 1944 (when much of Poland had been occupied by the
Red Army) Armia Ludowa had some 20,000–30,000 members, 5,000 of them being Soviet nationals. Until early 1943, the Soviet partisans focused primarily on survival deep behind enemy lines, with their activity limited mostly to
sabotage and
diversion rather than armed struggle against German forces and collaborationist
police units. During this early period various Soviet partisan groups also collaborated with the local
Polish resistance of
ZWZ, later renamed the
AK. The Polish
underground was established in the area in the fall 1939. Polish resistance was both anti-
Nazi and anti-Soviet; their attitude represented the fact that both powers had invaded Poland, and
Polish citizens suffered from Soviet terror just as they did from Nazi terror. ==Late war==