This two-volume monograph is focused on preparation of Germany and the USSR for the war and battles on the Russian western border, 4000 km long. This book offers new corrected information about the armies on both sides and their arms. Volume one contents: Preparation of Germany to the war; Preparation to the war in the USSR; The Beginning of the Great Patriotic War; Battles at the Ukrainian and Moldovan borders; The Belorussian battle; Battles in the Baltic states and the Russian North. Viktor Svishchev, a professional soldier and military historian, describes the main characteristics of both armies and the main battles and military actions at the beginning of the war. Bibliography (489 titles).