[1] Jonas Semaška was born on 24 November 1907 in Naujadvaris [lt] village, Ramygala county, Panevėžys district.

[2] On 17-20 June 1932, together with the honour guard company, Semaška participated in the consecration of the monument to the fallen Lithuanian soldiers in Giedraičiai.

[2] Together with the battalion, commanded by Captain V. Klimavičius, Semaška was sent in April to the Vinnytsia Oblast, then in Reichskommissariat Ukraine, to protect the railways and the strategic road, the Durchgangsstrasse IV, under construction to the south.

[2] After receiving the permission of Arthur Schmidt, the Sixth Army's chief of staff, the 7th Lithuanian battalion led by Captain Jonas Semaška, broke through 3 encirclement lines.

[2] The 13th Battalion fought against the Soviet army in the battles near Lake Ilmen, Pskov, Velikiye Luki.

[2] Together with Captain Stepas Januševičius and two other liaison officers (Lithuanian: ryšininkai), Semaška returned to Lithuania while hiding at night.

[2] By his order, the Samogitian Legion (Lithuanian: Žemaičių legionas) was recreated on 1 October 1945, which he commanded.

[2] On 15 March 1946, he met with the commander of the Lithuanian National Council, Jonas Noreika, nom-de-guerre General Storm.

[2] From Noreika, Semaška received instructions on the reorganization of the partisan units into the Lithuanian Armed Forces.

[2] Semaška also accepted the offer to command the future Lithuanian Army's Šiauliai military district.

[2] On 13 October 1946, by order of the Central Committee of the LSSR VKP(b) in the show trial held in Telšiai, Semaška was sentenced to death by the MVD Vilnius garrison's military tribunal.

[2] On 20 November 1994, the bodily remains of Jonas Semaška were identified in the mass grave in Tuskulėnai Manor.