Przysiężniak finished the Volhynian School for Reserve Cadets of Artillery in Włodzimierz Wołyński in 1938. He then began his military service in the 16th Pomeranian Regiment of Light Artillery in Grudziądz. He took part in the Invasion of Poland in 1939, against the Nazi invaders. On September 28, 1939, he was captured by the Germans at Tomaszów Lubelski, but on his way to the POW camp he managed to escape. In 1942 he joined the National Military Organization and was made the commander of its units in the Krasnystaw county. He headed a unit that specialized in diversion and sabotage which later the merger with the Home Army (AK-NOW). Eventually, he was promoted to the rank of major.
