Armistice of Cassibile in the context of "Marshal of Italy"

Italy entered World War II on 10 June 1940 by invading France, joining the German offensive already in progress. Italian dictator Benito Mussolini did so opportunistically as the Allied powers (chiefly France and the United Kingdom) seemed on the verge of collapse. The Italian war aim was to expand its colonial empire at the expense of the French and the British. While France surrendered on 22 June 1940, the United Kingdom and its allies continued to fight far beyond the point which Mussolini had thought possible, ultimately leading to the defeat and dissolution of Fascist Italy in 1943 when Mussolini was deposed in a bloodless coup d'état.

Italy's Axis partner, Nazi Germany, was ready for its defection and occupied central and northern Italy after the armistice of Cassibile in September 1943. After freeing Mussolini from captivity, the Germans set him up as the leader of a new puppet state in the north, the Italian Social Republic. This provoked Italian resistance against the German occupation and also a civil war between pro- and anti-fascist Italians. In the Allied-held south, the Kingdom of Italy officially became a co-belligerent of the Allies and declared war on Germany on 13 October 1943.

Salerno (UK: /sæˈlɛərnoʊ/, US: /səˈ-, sɑːˈ-, səˈlɜːrnoʊ/; Italian: [saˈlɛrno] ; Neapolitan: Salierno [saˈljernə]) is an ancient city and comune (municipality) in Campania, southwestern Italy, and is the capital of the province of the same name. It is the second largest city in the region by number of inhabitants, after Naples. It is located on the Gulf of Salerno on the Tyrrhenian Sea. Some of the Allied landings during Operation Avalanche (the invasion of Italy) occurred near Salerno. For a time the city became home to Victor Emmanuel III, the King of Italy, who moved from Rome in 1943 after Italy negotiated a peace with the Allies in World War II. Salerno thus became the capital of the Kingdom of the South, the seat of the provisional government and Italy's de facto capital for six months. The city has 125,958 inhabitants as of 2025.

Human settlement at Salerno has a rich past dating back to pre-historic times. In the early Middle Ages it was an independent Lombard principality, the Principality of Salerno, which around the 11th century comprised most of Southern Italy. During this time, the Schola Medica Salernitana, the first medical school in the world, was founded. In 1077, the Normans made Salerno the capital of their lands in all of continental southern Italy. In the 16th century, under the Sanseverino family, who were among the most powerful feudal lords in southern Italy, the city became a great centre of learning, culture and the arts, and the family hired several of the greatest intellectuals of the time. Later, in 1694, the city was struck by several catastrophic earthquakes and plagues. During a period of Spanish rule the city suffered a crisis which would last until the 18th century, but under Napoleon Salerno became part of the Parthenopean Republic. In the 19th century Salerno supported ideas of the Risorgimento and welcomed Garibaldi in 1861.

The Italian campaign of World War II, also called the Liberation of Italy following the German occupation in September 1943, consisted of Allied and Axis operations in and around Italy, from 1943 to 1945. The joint Allied Forces Headquarters (AFHQ) was operationally responsible for all Allied land forces in the Mediterranean theatre and it planned and led the invasion of Sicily in July 1943, followed in September by the invasion of the Italian mainland and the campaign in Italy until the surrender of the Axis forces in Italy in May 1945.

The invasion of Sicily in July 1943 led to the collapse of the Fascist Italian regime and the fall of Mussolini, who was deposed and arrested by order of King Victor Emmanuel III on 25 July. The new government signed an armistice with the Allies on 8 September 1943. However, German forces soon invaded northern and central Italy, committing several atrocities against Italian civilians and army units who opposed the German occupation and started the Italian resistance movement. Mussolini, who was rescued by German paratroopers, established a collaborationist puppet state, the Italian Social Republic (RSI), to administer the German-occupied territory. On 13 October 1943, the Allies recognized Italy as a co-belligerent in the war against Germany. Thereafter, the Italian Co-Belligerent Army and the Italian partisans fought alongside the Allies against German troops and the collaborationist National Republican Army; an aspect of this period is the Italian civil war. In the summer of 1944, after the Axis defeats at Cassino and Anzio, central Italy, including Rome, was liberated. Northern Italy was liberated following the final spring offensive and the general insurrection of Italian partisans on 25 April 1945. Mussolini was captured by the Italian resistance and summarily executed by firing squad. The campaign ended when Army Group C surrendered unconditionally to the Allies on 2 May 1945, one week before the formal German Instrument of Surrender. Both sides committed war crimes during the conflict, and the independent states of San Marino and Vatican City surrounded by Italian territory also suffered damage.

The Republican Fascist Party (Italian: Partito Fascista Repubblicano, PFR) was a political party in Italy led by Benito Mussolini and the sole representative party of the Italian Social Republic during the German occupation of Italy. The PFR was the successor to the National Fascist Party but was more influenced by pre-1922 early radical fascism and anti-monarchism, as its members considered King Victor Emmanuel III to be a traitor after his agreement of the signing of the surrender to the Allies.

Operation Achse (German: Fall Achse, lit. 'Case Axis'), originally called Operation Alaric (Unternehmen Alarich), was the codename for the German operation to forcibly disarm the Italian armed forces after Italy's armistice with the Allies on 3 September 1943.

Several German divisions had entered Italy after the fall of Benito Mussolini in July 1943, while Italy was officially still an ally of Germany, despite the protests of the new Italian government under Pietro Badoglio. The armistice was made public on 8 September. German forces moved rapidly to take over the Italian zones of occupation in the Balkans and southern France, and to disarm Italian forces in Italy.

The Italian Civil War (Italian: Guerra civile italiana, pronounced [ˈɡwɛrra tʃiˈviːle itaˈljaːna]) was a civil war in the Kingdom of Italy fought during the Italian campaign of World War II between Italian fascists and Italian partisans (mostly politically organized in the National Liberation Committee) and, to a lesser extent, the Italian Co-belligerent Army.

Many Italian fascists were soldiers or supporters of the Italian Social Republic, a collaborationist puppet state created under the direction of Nazi Germany during its occupation of Italy. The Italian Civil War lasted from around 8 September 1943 (the date of the Armistice of Cassibile, between Italy and the Allies) to 2 May 1945 (the date of the Surrender at Caserta). The Italian partisans and the Italian Co-belligerent Army of the Kingdom of Italy, sometimes materially supported by the Allies, simultaneously fought against the occupying Nazi German armed forces. Armed clashes between the fascist National Republican Army of the Italian Social Republic and the Italian Co-belligerent Army of the Kingdom of Italy were rare, while clashes between the Italian fascists and the Italian partisans were common. There were also some internal conflicts within the partisan movement. In this context, Germans, sometimes helped by Italian fascists, committed several atrocities against Italian civilians and troops.

The Royal Italian Army (Italian: Regio Esercito) was the land forces of the Kingdom of Italy during World War II, it was active from 1940 until the end of the war in 1945. During the war, a total about 2.56 million conscripts and volunteers served in the Royal Italian Army.

In the aftermath of the Armistice of Cassibile in September 1943, the Royal Italian Army became the Italian Co-belligerent Army fighting alongside the Allies, while the National Republican Army was created by the Italian Social Republic to fight alongside the Axis.