As a Bolshevik army of about 4.000 men, commanded by General Muravyov, advances towards Kyiv, with the aim of capturing the city, a small Ukrainian unit of 400 soldiers - about 300 of which are students - is resisting near the railroad station of Kruty. The clash between the opposite and unequal forces rages, with terrible fury. Young people, like Spartan soldiers, sacrifice themselves in a struggle against aggressors.