Italian invasion of Egypt in the context of "Mersa Matruh"

The history of Egypt under the British lasted from 1882, when it was occupied by British forces during the Anglo-Egyptian War, until 18 June 1956, when the last British forces withdrew in accordance with the Anglo-Egyptian evacuation agreement of 1954. The first period of British rule (1882–1914) is often called the "veiled protectorate". During this time the Khedivate of Egypt remained an autonomous province of the Ottoman Empire, and the British occupation had no legal basis but constituted a de facto protectorate over the country. Egypt was thus not part of the British Empire. This state of affairs lasted until 1914 when the Ottoman Empire joined World War I on the side of the Central Powers and Britain declared a protectorate over Egypt. The ruling khedive, Abbas II, was deposed and his successor, Hussein Kamel, compelled to declare himself Sultan of Egypt independent of the Ottomans in December 1914.

The formal protectorate over Egypt outlasted the war for only a short period. It was brought to an end when the British government issued the Unilateral Declaration of Egyptian Independence on 28 February 1922. Shortly afterwards, Sultan Fuad I declared himself King of Egypt, but the British occupation continued, in accordance with several reserve clauses in the declaration of independence. The situation was normalised in the Anglo-Egyptian treaty of 1936, which granted Britain the right to station troops in Egypt for the defence of the Suez Canal, its link with India. Britain also continued to control the training of the Egyptian Army. During World War II (1939–1945), Egypt came under attack from Italian Libya on account of the British presence there, although Egypt itself remained neutral until late in the war.

The Greco-Italian War, also called the Italo-Greek War, took place between Italy and Greece from 28 October 1940 to 23 April 1941. This conflict began the Balkans campaign of World War II between the Axis powers and the Allies, and eventually turned into the Battle of Greece with British and German involvement. On 10 June 1940, Italy declared war on France and the United Kingdom. By September 1940, the Italians had invaded France, British Somaliland and Egypt. This was followed by a hostile press campaign in Italy against Greece, accused of being a British ally. A number of provocations culminated in the sinking of the Greek light cruiser Elli by the Italians on 15 August. On 28 October, Mussolini issued an ultimatum to Greece demanding the cession of Greek territory, which the Prime Minister of Greece, Ioannis Metaxas, rejected.

Italy's invasion of Greece, launched with the divisions of the Royal Army based in Italian-controlled Albania, badly armed and poorly commanded, resulted in a setback: the Italian forces encountered unexpectedly tenacious resistance by the Hellenic Army and penetrated only a few kilometers into Greek territory and had to contend with the mountainous and muddy terrain on the Albanian–Greek border. With British air and material support, the Greeks stopped the Italian invasion just inside Greek territory by mid-November and subsequently counter-attacked with the bulk of their mobilized army to push the Italians back into Albania – an advance which culminated in the Capture of Klisura Pass in January 1941, a few dozen kilometers inside the Albanian border. The defeat of the Italian invasion and the Greek counter-offensive of 1940 have been called the "first Axis setback of the entire war" by Mark Mazower.

The Western Desert campaign (Desert War) took place in the deserts of Egypt and Libya and was the main theatre in the North African campaign of the Second World War. Military operations began in June 1940 with the Italian declaration of war and the Italian invasion of Egypt from Libya in September. Operation Compass, a five-day raid by the British in December 1940, was so successful that it led to the destruction of the Italian 10th Army (10ª Armata) over the following two months. Benito Mussolini sought help from Adolf Hitler, who sent a small German force to Tripoli under Directive 22 (11 January). The Afrika Korps (Generalleutnant Erwin Rommel) was formally under Italian command, as Italy was the main Axis power in the Mediterranean and North Africa.

In the spring of 1941, Rommel led Operation Sonnenblume, which pushed the Allies back to Egypt except for the siege of Tobruk at the port. At the end of 1941, Axis forces were defeated in Operation Crusader and retired again to El Agheila. In early 1942 Axis forces drove the Allies back again, then captured Tobruk after the Battle of Gazala but failed to destroy their opponents. The Axis invaded Egypt and the Allies retreated to El Alamein, where the Eighth Army fought two defensive battles, then defeated the Axis forces in the Second Battle of El Alamein in October 1942. The Eighth Army drove Axis forces out of Libya to Tunisia, which was invaded from the west by the Allied First Army in Operation Torch. In the Tunisian campaign the remaining Axis forces surrendered to the combined Allied forces in May 1943.