After the outbreak of the Second World War, Lithuania was occupied first by the Soviet Union in 1940, then by Germany in 1941 and finally by the Soviet Union again in 1944.
Yn ystod yr Ail Ryfel Byd meddiannwyd hi gan yr Undeb Sofietaidd ym 1940, gan yr Almaen ym 1941, a gan yr Undeb Sofietaidd drachefn ym 1944.