"On a balloon! During the siege of Paris" is an exciting journey into the sky with Gaston Tissandier. In this book, the author tells about his hobbies and adventures during the siege of Paris in 1870, when he and his brother Ernest made a series of aerostatic flights to communicate with the besieged city. They became the first aviators who used a balloon for military purposes. This book is a fascinating combination of history, technology and adventure, revealing to the reader a unique episode in the military and aviation history of France.