Good stamp. 

 In 1941 Hungary participated in its first military maneuvers as part of the Axis. Thus the Hungarian army was part of the invasion of Yugoslavia, gaining some more territory. On 22 June 1941, Germany invaded the Soviet Union under Operation Barbarossa; Hungary joined the German effort and declared war on the Soviet Union on 26 June, and formally entered World War II on the side of the Axis. In late 1941, the Hungarian troops on the Eastern Front experienced success at the Battle of Uman. By 1943, after the Hungarian Second Army suffered extremely heavy losses at the River Don, the Hungarian government sought to negotiate a surrender with the Allies. On 19 March 1944, as a result of this duplicity, German troops occupied Hungary in what was known as Operation Margarethe. By then it was clear that Hungarian politics was suppressed by Hitler's intent to hold the country in war on the side of the Nazi Third Reich because of its strategic location. On 15 October 1944, Miklós Horthy made a token effort to disengage Hungary from the war. This time the Germans launched Operation Panzerfaust and Horthy was replaced by a puppet government under the pro-German Prime Minister Ferenc Szálasi. Szálasi and his pro-Nazi Arrow Cross Party remained loyal to the Germans until the end of the war. In late 1944, Hungarian troops on the Eastern Front again experienced success at the Battle of Debrecen, but this was followed immediately by the Soviet invasion of Hungary and the Battle of Budapest. During the German occupation in May–June 1944, the Arrow Cross Party and Hungarian police deported nearly 440,000 Jews, mostly to Auschwitz. The Swedish Diplomat Raoul Wallenberg managed to save a considerable number of Hungarian Jews by giving them Swedish passports, but when the soviets arrived he was arrested as a spy and disappeared. Nuncio Angelo Rotta and other Italian, Spanish and Swiss diplomats also organized false papers and safe houses for Jews in Budapest. Hundreds of Hungarian people were executed by the Arrow Cross Party for sheltering Jews.