 When the fortress was overrun on September 29, 1939, he was taken prisoner of war and placed in the Działdowo prisoner's camp, from which, after several days, per the capitulation agreement, he was released.He returned to Warsaw changing his name and address in order to safely join the Polish resistance.From January 1940 he was employed by the local Electric Transit Authority (EKD) as a conductor and motorman; then, as a technician in the Division of Track.