Mieželis was born on November 27, 1894, in Jakštai, Daugailiai County, Russian Empire.[1] His parents were farmers.[4] He graduated from A. Lebedev's Private Gymnasium in Moscow.[5]
In 1919 he was mobilized as an officer into the Red Army.[1] He served on the Southern and Caucasus fronts and in the Reserve Army.[1] In 1921 he was an inspector of the Eleventh Army, Assistant Commander of the Territorial Brigade of the Azerbaijani Red Army.[1] On June 6, 1921, he became ill with cholera.[1]
Interwar Lithuania
Mieželis with brigadier general uniform in the late 1930s
In November 1921 Mieželis illegally returned to Lithuania, and was mobilized into the Lithuanian Armed Forces in 1922.[1] In 1922–23 he was Assistant Clerk of the Military Court, in 1923–26 – Clerk.[1] In 1926 he graduated from the Faculty of Law of the University of Lithuania.[1] In 1926–38 he worked in the Lithuanian Armed Forces Court.[1]
Mieželis contributed to the preparation of the military justice project.[1] Moreover, he collaborated with journals Kardas, Mūsų žinynas, Teisė, and Lithuanian Encyclopedia.[1]
In 1941 Mieželis was a participant of the June Uprising in Lithuania (worked at headquarters).[1] During the German Nazis occupation of Lithuania in 1941, he was the representative of the Lithuanian Red Cross to assist the victims of the war, and in 1941–44 he was a judge of the Court of Appeal.[1] He was engaged in the anti-Nazi resistance.[1]
