Hungary occupied and annexed territories during World War II that it had lost to Yugoslavia in the Treaty of Trianon after World War I. On 11 April 1941, 80,000 Hungarian troops crossed the Yugoslav border to join the German-led Axis invasion. Despite only sporadic resistance, Hungarian troops killed many civilians during the invasion. The Hungarian authorities deported tens of thousands of Serbs from the territories, re-settling Hungarians from other parts of Hungary. Resistance to the occupation began in the latter half of 1941, and in January 1942 the Hungarian military conducted retaliatory raids that killed over 3,300 people, mostly Serbs and Jews. In March 1944, when Hungary began to negotiate with the Allies, Germany invaded and took control of Hungary, including the annexed territories. The remaining Jews were collected and transported to extermination camps, where 85 per cent of those from the occupied territories died. The territories were restored to Yugoslav control as the Germans were pushed out of the region in late 1944 and 1945. (Full article...)