The Italian invasion of Albania was a brief military campaign by the Kingdom of Italy against the Kingdom of Albania. The conflict was a result of the imperialist policies of Italian dictator Benito Mussolini. Albania was rapidly overrun, its ruler, King Zog I, forced into exile in neighbouring Greece, and the country made part of the Italian Empire as a protectorate in personal union with the Italian crown.

The Italian invasion of British Somaliland was part of the East African campaign (1940–1941) in which Italian, Eritrean and Somali forces of Fascist Italy entered British Somaliland and defeated its combined garrison of British, Commonwealth and colonial forces supported by Somali irregulars. The Italian victory was based on mobility and speed but was hampered by the terrain, rainy weather and British resistance.

The Battle of Crete was fought during the Second World War on the Greek island of Crete. It began on the morning of 20 May 1941, when Nazi Germany began an airborne invasion of Crete. Greek and other Allied forces, along with Cretan civilians, defended the island. After one day of fighting, the Germans had suffered heavy casualties and the Allied troops were confident that they would defeat the invasion. The next day, through communication failures, Allied tactical hesitation and German offensive operations, Maleme Airfield in western Crete fell, enabling the Germans to land reinforcements and overwhelm the defensive positions on the north of the island. Allied forces withdrew to the south coast. More than half were evacuated by the British Royal Navy and the remainder surrendered or joined the Cretan resistance. The defence of Crete evolved into a costly naval engagement; by the end of the campaign the Royal Navy's eastern Mediterranean strength had been reduced to only two battleships and three cruisers.

The Italian invasion of Egypt was an offensive in the Second World War, against British, Commonwealth and Free French forces in the Kingdom of Egypt. The invasion by the Italian 10th Army ended border skirmishing on the frontier and began the Western Desert Campaign (1940–1943) proper. The Italian strategy was to advance from Libya along the Egyptian coast to seize the Suez Canal. After numerous delays, the scope of the offensive was reduced to an advance as far as Sidi Barrani and the engagement of any British forces in the area.

The Italian invasion of France, also called the Battle of the Alps, was the first major Italian engagement of World War II and the last major engagement of the Battle of France.

The Battle of Greece is the common name for the invasion of Allied Greece by Fascist Italy and Nazi Germany in April 1941 during World War II. The Italian invasion in October 1940, which is usually known as the Greco-Italian War, was followed by the German invasion in April 1941. German landings on the island of Crete came after Allied forces had been defeated in mainland Greece. These battles were part of the greater Balkan Campaign of Germany.

The Invasion of Yugoslavia, also known as the April War or Operation 25, was a German-led attack on the Kingdom of Yugoslavia by the Axis powers which began on 6 April 1941 during World War II. The order for the invasion was put forward in "Führer Directive No. 25", which Adolf Hitler issued on 27 March 1941, following the Yugoslav coup d'état.