Arrested by the Soviets, he escaped and returned to his native Vilnius, where he soon joined the Polish underground: the Service for Poland's Victory, the Union of Armed Struggle and finally the Home Army.

He took part in the Operation Ostra Brama as commanding officer of the East group attacking the city of Vilnius from the direction of Naujoji Vilnia and Belmontas.

During his service in the underground, he used a variety of noms de guerre, including "Meteor", "Kurkowski", "Pohorecki", "Lawicz", "Krzysztof", "Roman Wrzeski" and "Kurcewicz".

A promising NCO, in 1935 he was allowed to join the Higher War School and in 1937 he was promoted to the rank of Captain and attached to the 20th Infantry Division's headquarters.

Taken prisoner by the Soviets in early October, he managed to escape and returned to his native Vilnius,[1] where he soon joined the Polish underground: the Service for Poland's Victory, the Union of Armed Struggle and finally the Home Army.

He took part in the Operation Ostra Brama as commanding officer of the East group attacking the city of Vilnius from the direction of Naujoji Vilnia and Belmontas.

from Vilnius region he formed the "Mobilisation Centre of the Wilno Home Army Area", a communications network intended to keep former soldiers of the Vilnian resistance in contact, should the situation in Europe change.