In search for her husband she illegally left the Soviet Union for Latvia, where they reconnected and Anastasiya eventually birthed a son Konstantine ten years later.

Through personal connections to high-ranking officials such as Mikhail Kalinin she managed to return to Dno, where she found employment working at a freight station and later as a rail conductor.

[4][5] Anastasia recruited and trained two young Komsomol members to the partisan unit, Zinaida Egorova and Nina Karabanova.

Zina Egorova had worked as a telephone operator at a military base before the war, and later as a waitress in a mess hall at a German airfield, where she communicated with pilots and technical personnel.

Subsequently, Nina contacted underground resistance members in the village of Skugra, where escape of prisoners of war and their transfer to a partisan detachment was organized.

In 1942, partisan intelligence agent Dmitri Yakovlev, who worked as a machinist before the war and escaped from German captivity traveled to Biseniek's apartment to meet his parents; but he did not carry any required identification documents with him.

Several days later paratroopers destroyed the German guns mounted to the bridge, but Anastasiya did not let Konstantin go on any more scouting missions after she suspected her eldest son Yura was killed in combat.

[4][5] She later established connections with the partisan unit named after V. I. Zinoviev through her son Yura, who had provided her with information about the detachment, which was located on the outskirts of the city near lake Beli at the time.

Anastasiya then told her son about the state of affairs in the area, specifically the locations of the commandant's office, the security company, and the improvised airfield with camouflaged anti-aircraft guns protecting a depot as well as names of local villagers who collaborated with the Nazis.

[2][4] On 2 October the Zinoviev detachment organized a large diversion on the Vyaz'ye-Bakach line in Novosokolniki-Bokach, south of the Dno station.

[4][5] In the winter of 1941 to 1942, German authorities increased security at the train station as well as at military bases and factories, reducing the number of sabotage operations the partisans could safely execute.

During the operation the detachment commander Zinoviev was killed in action and her son Yura was injured by shelling but taken off the battlefield by another partisan.

[5] In December 1941, three partisans who participated in battle as part of the 95th Detachment, returned Dno and put Anastasiya in charge of overseeing the railroad attack.

The next week he organized several attacks on German-controlled portions of the railroad, handing out anti-train mines to other machinists, telling them to plant them as far outside the city as they could and then stay off the radar.

[2] After Anastasiya realized she would likely be arrested again soon she decided to hand over all the supplies she had accumulated to partisans in Leningrad who were still running sabotage campaigns.

Anastasiya helped the remaining partisans in the city left in the middle of the night to nearby rural villages, finding safehouses for them over a period of three days.

After a while, her captors employed psychological torture by showing her the outside world for brief moments, transporting her to the outskirts of Porkhov to the ruins of an ancient fortress and permitted her to walk along a riverbank; she still refused to make any confessions or name any resistance members.

In the Zapolyansky camp, where resistance members, partisans, and prisoners of war who refused to cooperate with the German authorities were detained and tortured.

Anastasiya's son Konstantin learned about the whereabouts of his mother and visited her several times, traveling from Dno and getting permission to speak to her through the fence.

A large granite memorial plaque inscribed with "Here, at the station Dno, during the temporary German-Fascist occupation of the city, Hero of the Soviet Union Biseniek Anastasia Alexandrovna participated in the underground resistance.

In the 1980s historian Nikolai Vassarionovich Masolov compiled her complete biography after speaking with her relatives and surviving members of her partisan detachment.