You could say you have to be brave to be a spy. You have to be especially brave to be a spy while traveling in a hot-air balloon above an enemy army camp or a battlefield. For a time, Cuban born Federico Fernández Cavada was such a spy during the American Civil War. He then went on to fight for liberation in his homeland where his life was tragically cut short.

Selections from the Federico Fernández Cavada: The Spy in the Hot-Air Balloon:

• Table of Contents
• Chapter 1

Voices in History™ is a Core Knowledge Biography Series that encourages young readers to learn about real superheroes in history. As a result of acts of extraordinary bravery, ingenuity, strength, and determination, these people made a difference and changed the world. Perhaps their remarkable stories will inspire young readers to become the superheroes of the future.