German invasion of GreeceThe German invasion of Greece, also known as the Battle of Greece or Operation Marita (Unternehmen Marita), was the attacks on Greece by Italy and Germany 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 (May 1941) came after Allied forces had been defeated in mainland Greece. These battles were part of the greater Balkans Campaign of the Axis powers and their associates.
Occupation of Czechoslovakia (1938–1945)The military occupation of Czechoslovakia by Nazi Germany began with the German annexation of the Sudetenland in 1938, continued with the creation of the Protectorate of Bohemia and Moravia, and by the end of 1944 extended to all parts of Czechoslovakia. Following the Anschluss of Austria in March 1938 and the Munich Agreement in September of that same year, Adolf Hitler annexed the Sudetenland from Czechoslovakia. The loss of the Sudetenland was detrimental to the defense of Czechoslovakia, as the extensive Czechoslovak border fortifications were also located in the same area.
Pact of SteelThe Pact of Steel (Stahlpakt, Patto d'Acciaio), formally known as the Pact of Friendship and Alliance between Germany and Italy, was a military and political alliance between Italy and Germany. The pact was initially drafted as a tripartite military alliance between Japan, Italy and Germany. While Japan wanted the focus of the pact to be aimed at the Soviet Union, Italy and Germany wanted the focus of it to be aimed at the British Empire and France.
Yugoslav coup d'étatThe Yugoslav coup d'état took place on 27 March 1941 in Belgrade, Kingdom of Yugoslavia, when the regency led by Prince Paul of Yugoslavia was overthrown and King Peter II fully assumed monarchical powers. The coup was planned and conducted by a group of pro-Western Serbian-nationalist Royal Yugoslav Army Air Force officers formally led by the Air Force commander, General Dušan Simović, who had been associated with several putsch plots from 1938 onwards.
Winter WarThe Winter War was a war between the Soviet Union and Finland. The war began with a Soviet invasion of Finland on 30 November 1939, three months after the outbreak of World War II, and ended three and a half months later with the Moscow Peace Treaty on 13 March 1940. Despite superior military strength, especially in tanks and aircraft, the Soviet Union suffered severe losses and initially made little headway. The League of Nations deemed the attack illegal and expelled the Soviet Union.
Axis powersThe Axis powers, originally called the Rome–Berlin Axis, was a military coalition that initiated World War II and fought against the Allies. Its principal members were Nazi Germany, the Kingdom of Italy, and the Empire of Japan. Alongside Italy, Romania and Hungary may also be considered among "the Reich's main allies". The Axis were united in their far-right positions and general opposition to the Allies, but otherwise lacked comparable coordination and ideological cohesion.
Boris III of BulgariaBoris III (Борѝс III ; Boris Treti; 28 August 1943), originally Boris Klemens Robert Maria Pius Ludwig Stanislaus Xaver (Boris Clement Robert Mary Pius Louis Stanislaus Xavier), was the Tsar of the Kingdom of Bulgaria from 1918 until his death in 1943. The eldest son of Ferdinand I, Boris assumed the throne upon the abdication of his father in the wake of Bulgaria's defeat in World War I. Under the 1919 Treaty of Neuilly, Bulgaria was forced to, amongst other things, cede various territories, pay crippling war reparations, and greatly reduce the size of its military.
Co-belligerenceCo-belligerence is the waging of a war in cooperation against a common enemy with or without a formal treaty of military alliance. Generally, the term is used for cases where no alliance exists. Likewise, allies may not become co-belligerents in a war if a casus foederis invoking the alliance has not arisen. Co-belligerents are defined in the Encyclopaedic Dictionary of International Law as "states engaged in a conflict with a common enemy, whether in alliance with each other or not".
