Deuxième arbitrage de Vienne
In August 1940, during the Second World War, the northern half of Transylvania (Northern Transylvania) was annexed to Hungary by the second Second Vienna Award, leaving Southern Transylvania to Romania. On March 19, 1944, following the occupation of Hungary by the Nazi German army through Operation Margarethe, Northern Transylvania came under German military occupation. After King Michael's Coup, Romania left the Axis and joined the Allies, and, as such, fought together with the Soviet Union's Red Army against Nazi Germany, regaining Northern Transylvania. The Second Vienna Award was voided by the Allied Commission through the Armistice Agreement with Romania (September 12, 1944) whose Article 19 stipulated the following: