At the center of the lyric-dramatic narrative is the front-line fate of one of the millions of ordinary soldiers of the Great Patriotic War - sapper Fyodor Chaklun and his four-legged assistant - a specially trained shepherd named Rumba. With the help of Rumba, Fedor discovers a mined section of the road and warns the senior in rank - junior lieutenant Svetlana. But the girl, carried away by flirting with the lieutenant colonel, forgets to block the road, and a Soviet tank is blown up on a mine. Fyodor, who is in love with Svetlana, takes the blame - Fidelity and devotion, high patriotism, a sense of duty and responsibility to his own conscience, love and friendship - these are the moral and human concepts that with honor will carry through the harsh military and life trials of Fedor Chaklun, Sveta, Tonya and other characters of the film story are ordinary liberating armies. The film is dedicated to them and to many of those who, having liberated their native land, did not live to the day of the Great Victory, and to those who came to Berlin with battles.