Mediterranean and Middle East theatre of World War II
Initial military operations

On 10 June 1940, Italy declared war on France and the United Kingdom and next day the British Commonwealth declared war on Italy. The fleets of Italy, France and the United Kingdom began the hostilities of the Battle of the Mediterranean. The siege of Malta soon began, with the first Italian air attack on 11 June. In the Western Desert, Royal Air Force (RAF) aircraft attacked Italian positions inside Libya. On 11 June, the Western Desert Campaign began, as the British launched minor raids and conducted patrols along the Libyan–Egyptian border and on 17 June, Fort Capuzzo was captured. On 20 June, Mussolini began the Italian invasion of France, just before the end of the Battle of France. During June, the East African Campaign began with Italian attacks in East Africa, although ground combat did not start until July.

On 22 June, France signed an armistice at Compiegne with Germany and on 24 June, the Franco-Italian Armistice was signed. Italy gained a 50 kilometres (31 mi) demilitarised zone inside France (as well as similar zones where Italian and French colonies met). Italian occupation forces took over an 832 km (321 sq mi) area of France, which included 28,500 people and the town of Menton. The Royal Navy attacked the French fleet in the North African port of Mers-el-Kébir on 3 July 1940, after it refused to sail to Britain or the French West Indies and demobilise, as part of a larger plan to stop the French fleet from falling into German or Italian hands.

When Italy entered the war, there were no plans for an invasion of Egypt while France was still able to resist. When France surrendered, Mussolini gave instructions for his generals to prepare an offensive. On 10 August, he instructed his forces to be prepared to attack in conjunction with the German invasion of the United Kingdom. While his generals did not believe they were prepared, they were ordered to push forward without any solid objectives.

On 9 September, Italian aircraft start preparation bombardments for the invasion of Egypt. Four days later, Italian infantry attacked and advanced as far as Sidi Barrani before digging in, 80 mi (130 km) west of the main British position at Mersa Matruh. In East Africa, after some initial offensive actions, the Italian conquest of British Somaliland began in August and annexed the colony. After crossing the Albanian border, Italian forces began the Greco-Italian War by invading Greece on 28 October. The Greek army repulsed the Italian attack and commenced a counter-offensive on 14 November, which pushed Italian forces back into Albania.

The Royal Navy inflicted a major setback upon the Italian Royal Navy during the Battle of Taranto on the night of 12/13 November. After assembling enough forces the British launched a counter-attack upon the Italians in Egypt. Operation Compass drove the Italians out of Egypt and resulted in the destruction of the Italian 10th Army in February 1941. Following this success, British forces adopted a defensive position in North Africa and redeployed most troops to Greece in Operation Lustre, leaving a weak force garrisoning the gains made from Operation Compass. In March, the Battle of Kufra ended with the Italians losing the desert oasis of Kufra—a vital link between Italian east and north Africa—which was located in south-eastern Libya.
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