[1][2] From 1953 to 1956, Algirdas Petrusevičius was second-in-command in the Kaunas underground organization "Geležinis vilkas" (Iron Wolf).
On Lithuania's independence day, February 16, 1956, he raised the Lithuanian flag in the Kaunas city hall square.
In the subsequent gun battle, he was arrested, sentenced and imprisoned in Siberia, being held at Ozerlag near Tayshet.
From 1990 to 1993 he led the newly independent Lithuania's Defense Department weapons arsenal "Vytis".
He invented pistol-machine guns Vytis suitable for guerilla war, as well as hand grenades, and along with his colleagues, land mines.