The book of Professor, Doctor of Historical Sciences I.M. Ananyev examines the theories of the combat use of tank troops that existed between the two world wars abroad and in the Soviet Union, talks about the creation of tank armies in the Soviet Armed Forces and the experience of their use during the Second World War. The role, place and tasks of tank armies in offensive operations, experience in preparing for operations, entering the battle (breakthrough) and military operations in the operational depth of the enemy's defense are investigated.