The first year of the war was the most difficult and bloody. The Red Army retreated under the blows of superior enemy forces. Sergei Mikheenkov's book tells about this difficult time. The author focuses on the actions of the 50th Army, which was able to stop the advance of Guderian. Then the army made a swift throw at Kaluga, which simultaneously cut the front of German troops and returned Kaluga and the entire warring country to Kaluga - an old Russian city on the Oka.