1939 assigned Estonia to the Soviet sphere of influence, prompting the beginning of the first Soviet occupation in 1940. After the German defeat in 1944
978-1-84176-353-8 (英文). Michel Thomas Poirier. RESULTS OF THE GERMAN AND AMERICAN SUBMARINE CAMPAIGNS OFWORLDWARII 互联网档案馆的存檔,存档日期2008-04-09.. 美國海軍. 1999年10月20日