It was opened in 1940 when Benito Mussolini ordered the invasion of the Kingdom of Greece. The failed Italian campaigns in the Balkans prompted a German response that ended with the subjugation of the Balkan nations.
The countries that sent significant amounts of their armies to this front were: Germany, the Independent State of Croatia, the United Kingdom and Italy. It should be noted that the partisans and guerrillas from Greece and Yugoslavia faced the troops of the Axis forces.
Luis Fernando Ruiz Valdez 