Are We Still Brothers?

As the Spanish Civil War breaks out, the Jimenez family splits apart the mother, Frida, takes her eldest son, Julio, away from his fascist father and brother, Jesus.
Julio doesn't know his dad but knows he hates him because he poisoned his younger brother with fascist propaganda and split the family with his fascist ideas.
Now he swears to his mom he'll kill every fascist for her sake and help establish a Communist Spain. After all, nothing is deadly than a boy who promises his mother something.