SU is crap, but what can you expect according to the point of view shown by relic in the campaign. History? No, propaganda!
Well the NKVD really captured and killed many AK members (Armia Krajowa - Polish Home Army).
Polish resistance soldiers fighting together with the Red Army at Vilnius:
After the city was taken from the Germans:
Uprising
On 12 June 1944 General Tadeusz Bór-Komorowski, Commander-in-Chief of the Home Army, issued an order to prepare a plan of liberating Vilnius from German hands. The Home Army districts of Vilnius and Navahrudak planned to take control of the city before the Soviets could reach it. The Commander of the Home Army District in Vilnius, then Wilno, General Aleksander Krzyżanowski "Wilk", decided to regroup all the partisan units in the northeastern part of Poland for the assault, both from inside the city and from the outside.
The starting date was set to 7 July. Approximately 12,500 Home Army soldiers attacked the German garrison and managed to seize most of the city center. Heavy street fighting in the outskirts lasted until 14 July. In Vilnius' eastern suburbs, the Home Army units cooperated with reconnaissance groups of the Soviet 3rd Belorussian Front.[1]
Soviets enter
General Krzyżanowski wanted to group all of the partisan units into a re-created Polish 19th Infantry Division. However, the advancing Red Army entered the city on 15 July and the NKVD started to intern all Polish soldiers. On 16 July the HQ of the 3rd Belorussian Front invited Polish officers to a meeting and arrested them.[2] [3] [4]
The internees, almost 5,000 officers, NCOs and soldiers, were sent to a provisional internment camp in Medininkai, a Vilnius suburb. Some of them were given the option of joining the 1st Polish Army which was integrated into the Soviet armed forces, while the majority were sent to the USSR.[5]
Subsequently, the remnants of the local Home Army HQ ordered all units to retreat to Rūdininkai Forest. It is estimated that by 18 July almost 6,000 soldiers and 12,000 volunteers reached the area. They were soon discovered by Soviet air reconnaissance and surrounded by the NKVD. Commanders decided to split their units and try to break through to the Białystok area. However, most of the Home Army forces were caught and interned.
After dispersing Lt. Col. Maciej Kalenkiewicz "Kotwicz" remained in the forests around the city with approximately 80-100 soldiers until early August. On 21 August, Kalenkiewicz's unit was engaged by the NKVD expeditionary forces, further reinforced by the NKVD Intelligence-Search Unit 3, Battalion 32, commanded by NKVD's Captain Shulkha, and Capt. Tshikin of the Regional NKVD detachment. During the battle, 39 Home Army Soldiers, including Major Kalenkiewicz were killed.
Yes, Vilnius after the war become part of the Soviet Union.