Army group in the context of "2nd Belorussian Front"

Army Group A (German: Heeresgruppe A) was the name of three distinct army groups of the Heer, the ground forces of the Wehrmacht, during World War II.

The first Army Group A, previously known as "Army Group South", was active from October 1939 to June 1941 and notably served in the Battle of France as the decisive army group in the implementation of the "Sickle Cut" military plan that inflicted crushing subsequent defeats on the French armed forces at occasions such as the Battle of Sedan, Battle of Boulogne and Battle of Dunkirk and that ultimately led to the Armistice of 22 June 1940. Army Group A was subsequently used in the German occupation of France and temporarily became the first Oberbefehlshaber West in German-occupied France. It was eventually replaced in this function by Army Group D and redeployed to German-occupied Poland in preparation for Operation Barbarossa. At the commencement of that attack, Army Group A was renamed "Army Group South" on 22 June 1941, ending the first deployment.

A field army (also known as numbered army or simply army) is a military formation in many armed forces, composed of two or more corps. It may be subordinate to an army group. Air armies are the equivalent formations in air forces, and fleets in navies. A field army is composed of 80,000 to 300,000 soldiers.

The 15th Army Group was an army group in World War II, composed of the British Eighth Army and initially the Seventh United States Army (1943), replaced by the Fifth United States Army (from January 1944), which apart from units from across the British Empire and United States, also had entire units from other allied countries/regions, including: one corps from Free France and one from Poland; one division from Brazil; multiple separate brigades of Italians and Greeks; plus support to, and from, local Italian partisans. It operated in the Italian Campaign from 1943 to 1945.

Army (軍, gun) was a term in the Imperial Japanese Army used in different ways to designate a variety of large military formations that corresponded to the army group, field army, and corps in the militaries of Western nations.

A front (Russian: фронт, romanized: front) is a type of military formation that originates in the Russian Empire, and has been used by the Polish Army, the Red Army, the Soviet Army, and Turkey. It is roughly equivalent to an army group in the military of most other countries. It varies in size but in general contains three to five armies. It should not be confused with the more general usage of military front, describing a geographic area in wartime.

The Transcaucasus Front (Russian: Закавказский Фронт), also translated as Transcaucasian Front, was a front of the Soviet Red Army—a military formation comparable to an army group, not a geographic military front—during the Second World War.

The Transcaucasus Front describes two distinct organizations during the war.

The Southern Front was a front, a formation about the size of an army group of the Soviet Army during the Second World War. The Southern Front directed military operations during the Soviet occupation of Bessarabia and Northern Bukovina in 1940 and then was formed twice after the June 1941 invasion by Germany, codenamed Operation Barbarossa.

During the Soviet occupation of Bessarabia and Northern Bukovina in 1940, the Soviets deployed three armies (12th, 5th and 9th). Altogether the Soviet Southern Front opposing Bessarabia and Bukovina consisted of 32 (or 31) rifle divisions, 2 (or 3) motorised rifle divisions, 6 cavalry divisions, 11 tank brigades, 3 airborne brigades (one in reserve), 14 corps artillery regiments, 16 artillery regiments of the Reserve of the Supreme High Command and 4 heavy artillery divisions. These force totalled around 460,000 men, ca. 12,000 guns and mortars, ca. 3,000 tanks and 2,160 aircraft.

The 1st Belorussian Front (Russian: Пéрвый Белорусский фронт, Pervyy Belorusskiy front, also romanized "Byelorussian"), known without a numeral as the Belorussian Front between October 1943 and February 1944, was a major formation of the Red Army during World War II, being equivalent to a Western army group. Alongside the 1st Ukrainian Front, it was the largest and most powerful among all Soviet fronts, as their main effort was to capture Berlin, the capital of Nazi Germany.