Military history of Italy during World War II in the context of "Fascist Italy"

World War II in the Kingdom of Yugoslavia began on 6 April 1941, when the country was invaded and swiftly conquered by Axis forces and partitioned among Germany, Italy, Hungary, Bulgaria and their client regimes. Shortly after Germany attacked the USSR on 22 June 1941, the communist-led republican Yugoslav Partisans, on orders from Moscow, launched a guerrilla liberation war fighting against the Axis forces and their locally established puppet regimes, including the Axis-allied Independent State of Croatia (NDH) and the Government of National Salvation in the German-occupied territory of Serbia. This was dubbed the National Liberation War and Socialist Revolution in post-war Yugoslav communist historiography. Simultaneously, a multi-side civil war was waged between the Yugoslav communist Partisans, the Serbian royalist Chetniks, the Axis-allied Croatian Ustaše and Home Guard, Serbian Volunteer Corps and State Guard, Slovene Home Guard, as well as Nazi-allied Russian Protective Corps troops.

Both the Yugoslav Partisans and the Chetnik movement initially resisted the Axis invasion. However, after 1941, Chetniks extensively and systematically collaborated with the Italian occupation forces until the Italian capitulation, and thereon also with German and Ustaše forces. The Axis mounted a series of offensives intended to destroy the Partisans, coming close to doing so in the Battles of Neretva and Sutjeska in the spring and summer of 1943.

On December 11, 1941, Italy declared war on the United States. The declaration followed the Japanese attack on Pearl Harbor four days earlier, and came the same day as Germany's declaration of war against the United States. Benito Mussolini publicly made the announcement in Rome on December 11. Shortly before Mussolini's speech, Italian Foreign Minister Galeazzo Ciano delivered the news to the head U.S. diplomat in Italy, George Wadsworth II.

The Italian, German, and Japanese governments had all signed the Tripartite Pact in 1940, formally allying the three powers with one another. Italy and Germany also signed the Pact of Steel military alliance in 1939. Italy had declared war on the United Kingdom and France on June 10, 1940, as Mussolini implemented the Pact of Steel and leveraged the German alliance to win advantages for Italy. Prior to Hitler's declaration of war against America there was little, if any, doubt that Italy would once again "follow Germany's lead."

When the United Kingdom declared war on Nazi Germany in September 1939 at the start of World War II, it controlled to varying degrees numerous crown colonies, protectorates, and India. It also maintained strong political ties to four of the five independent Dominions—Australia, Canada, South Africa, and New Zealand—as co-members (with the UK) of the British Commonwealth. In 1939 the British Empire and the Commonwealth together comprised a global power, with direct or de facto political and economic control of 25% of the world's population, and of 30% of its land mass.

The contribution of the British Empire and Commonwealth in terms of manpower and materiel was critical to the Allied war-effort. From September 1939 to mid-1942, the UK led Allied efforts in multiple global military theatres. Commonwealth, Colonial and Imperial Indian forces, totalling close to 15 million serving men and women, fought the German, Italian, Japanese and other Axis armies, air-forces and navies across Europe, Africa, Asia, and in the Mediterranean Sea and the Atlantic, Indian, Pacific and Arctic Oceans. Commonwealth forces based in Britain operated across Northwestern Europe in the effort to slow or stop Axis advances. Commonwealth airforces fought the Luftwaffe to a standstill over Britain, and Commonwealth armies defeated Italian forces in East Africa and North Africa and occupied several overseas colonies of German-occupied European nations. Following successful engagements against Axis forces, Commonwealth troops invaded and occupied Libya, Italian Somaliland, Eritrea, Ethiopia, Iran, Iraq, Syria, Lebanon, Iceland, the Faroe Islands, and Madagascar.

Rodolfo Graziani, 1st Marquis of Neghelli (US: /ˌɡrɑːtsiˈɑːni/ GRAHT-see-AH-nee, Italian: [roˈdɔlfo ɡratˈtsjaːni]; 11 August 1882 – 11 January 1955), was an Italian military officer in the Kingdom of Italy's Royal Army, primarily noted for his campaigns in Africa before and during World War II. A dedicated and prominent member of the National Fascist Party, he was a key figure in the Italian military during the regime of Benito Mussolini.

Graziani played an important role in the consolidation and expansion of the Italian colonial empire during the 1920s and 1930s, first in Libya and then in Ethiopia. He became infamous for harsh repressive measures, such as the use of concentration camps that caused many civilian deaths, and for extreme measures taken against the native resistance of the countries invaded by the Italian army, such as the hanging of Omar Mukhtar. Due to his brutal methods used in Libya, he was nicknamed Il macellaio del Fezzan ("the butcher of Fezzan"). In February 1937, after an assassination attempt against him during a ceremony in Addis Ababa, Graziani ordered a period of brutal retribution now known as Yekatit 12. Shortly after Italy entered World War II, he returned to Libya as the commander of troops in Italian North Africa but resigned after the 1940–41 British offensive routed his forces; this campaign caused him other stress attacks, which he suffered from a snake accident during his military service in Libya a few years before World War I.