A front mobile group is a grouping of several tank armies as a primary armoured force of the Front

Front (Soviet Army)

A front was a major military organization in the Soviet Army during many wars. It was roughly equivalent to an army group in the militaries of most other countries except Germany...

 commander for use in developing breakthrough

Breakthrough (military)

A breakthrough occurs when an offensive force has broken the enemy defensive line, and is rapidly exploiting the gap.Usually, large force is employed on a relatively small portion of the front to achieve this...

s during an offensive

Offensive (military)

An offensive is a military operation that seeks through aggressive projection of armed force to occupy territory, gain an objective or achieve some larger strategic, operational or tactical goal...

, particularly in achieving strategic goals

Strategic goal (military)

A strategic military goal is used in strategic planning to define desired end-state of a war or a campaign. Usually it entails either a strategic change in enemy's military posture, intentions or ongoing operations, or achieving a strategic victory over the enemy that ends the conflict, although...

. Usually forming the second echelon, and employing from one to three tank armies, these were used with great success by the Red Army

Red Army

The Workers' and Peasants' Red Army started out as the Soviet Union's revolutionary communist combat groups during the Russian Civil War of 1918-1922. It grew into the national army of the Soviet Union. By the 1930s the Red Army was among the largest armies in history.The "Red Army" name refers to...

 during the fighting on the Eastern Front

Eastern Front (World War II)

The Eastern Front of World War II was a theatre of World War II between the European Axis powers and co-belligerent Finland against the Soviet Union, Poland, and some other Allies which encompassed Northern, Southern and Eastern Europe from 22 June 1941 to 9 May 1945...

 of the Second World War. On occasion when either the tank army was unavailable, or the terrain was not suitable for the employment of large number of tank

Tank

A tank is a tracked, armoured fighting vehicle designed for front-line combat which combines operational mobility, tactical offensive, and defensive capabilities...

s and self-propelled artillery

Self-propelled artillery

Self-propelled artillery vehicles are combat vehicles armed with artillery. Within the term are covered self-propelled guns and rocket artillery...

, only a cavalry mechanized group

Cavalry Mechanized Group

A cavalry-mechanized group was a type of military formation used in the Red Army during World War II against Germany and Japan.- Organization :...

 was used. The Front mobile group was usually used to deepen the penetration of the enemy front 70-100km or more. The organisation of the Front mobile group was retained by the Soviet Army

Soviet Army

The Soviet Army is the name given to the main part of the Armed Forces of the Soviet Union between 1946 and 1992. Previously, it had been known as the Red Army. Informally, Армия referred to all the MOD armed forces, except, in some cases, the Soviet Navy.This article covers the Soviet Ground...

 during the Cold War

Cold War

The Cold War was the continuing state from roughly 1946 to 1991 of political conflict, military tension, proxy wars, and economic competition between the Communist World—primarily the Soviet Union and its satellite states and allies—and the powers of the Western world, primarily the United States...

 in the Group of Soviet Forces in Germany

Group of Soviet Forces in Germany

The Group of Soviet Forces in Germany , also known as the Group of Soviet Occupation Forces in Germany and the Western Group of Forces were the troops of the Soviet Army in East Germany....

 known as second echelon tank forces. The employment of the tank armies is intended to create a local numerical superiority on a narrow front of 3-5:1 in manpower, 6-8:1 in tanks and artillery

Artillery

Originally applied to any group of infantry primarily armed with projectile weapons, artillery has over time become limited in meaning to refer only to those engines of war that operate by projection of munitions far beyond the range of effect of personal weapons...

, and 3-5:1 in Combat aircraft.