 Romania entered World War II under the command of the German Wehrmacht in June 1941, declaring war on the Soviet Union to recover Bessarabia and northern Bukovina.Romania continued to participate in the invasion after recovering the territories and was also awarded the territory between Dniester and the Southern Bug by Germany to administer under the name of "Transnistria", where Romanians built a concentration camp for the extermination of Jews.During the war, Romania was the most important source of oil for Nazi Germany, prompting multiple Allied bombing raids.