The book is dedicated to the history of the armored forces of the Red Army. The author pays special attention to the actions of the mechanized corps of the Red Army and the period of the tragic events of the summer of 1941, when a tank battle took place in the Dubno area, the “Lepel counterattack” of the 5th and 7th mechanized corps. This book, for the first time, describes in detail the combat path of each mechanized corps, provides extensive information on the organizational structure, command staff, formation of mechanized units, the availability of equipment and weapons. The book is equipped with appendices and will be of interest to both specialists and lovers of military history.