During their training, Celeritas introduces Choiseul, a French deserter, and his dragon Praecursoris, whom Temeraire views as competition. Choiseul is revealed to be a double agent when he attempts to kidnap Lily and Captain Harcourt. After interrogation, he admits that he was actually sent to steal Temeraire, whom the Chinese had gifted to Napoleon as his personal mount. The spirits of the captains, dragons, and crew are bolstered by the victory at the Battle of Trafalgar (October 1805), which erases Napoleon's navy and diminishes his aerial strength; additionally, while Nelson is raked by fire from a Spanish Flecha-del-Fuego, he survives to fight another day. While they are celebrating, Rankin and a mortally wounded Levitas arrive at Dover with important intelligence: Napoleon had not planned to send troops over by sea, as originally predicted. Instead, he plans to send them by air, using transports hauled by dragons, accompanied by Napoleon's aerial force. This disrupts celebrations as the captains at the Dover covert prepare for combat, knowing their great disadvantage in numbers.