Eu nunca teria pensado que existem tantos livros que correspondem à minha descrição. Eu finalmente encontrei o livro que eu estava procurando:
é a Dragonmaster Series de Chris Bunch , que inclui Storm of Wings (2002), Cavalaria do Dragão (2003), e A Última Batalha (2004).
Dragonmaster is an action trilogy following the life and exploits of Hal Kailas, a peasant who left home at an early age. During his early years Hal must work as a casual laborer. His dream is to fly dragons, so he joins a traveling troupe who give rides on dragons as entertainment from town to town. Hal is away from his home country and his king, Asir. When war breaks out, he is drafted into the army as an unwilling soldier. However, he does his best and works his way through the ranks of the army and society with his heroic exploits. Dragons are mainly wild and untamed creatures that are brought into the war, while Hal and others devise new and more damaging ways to use the dragons against their enemies. This tale is told in the first two books, which contain bloody action throughout. The third book covers life after the war, the difficulties ex-soldiers face, and how Hal deals with it.