Arabella and the Battle of Venus — David D. Levine

Arabella's wedding plans to marry Captain Singh of the Honorable Mars Trading Company are interrupted when her fiancé is captured by the French and sent to a prisoner-of-war camp on swampy Venus. Now, Arabella must find passage to an enemy-controlled planet in the middle of a war, bribe or fight her way past vicious guards, and rescue her Captain.

To do this she must enlist the help of the dashing privateer, Daniel Fox of the Touchstone and build her own clockwork navigational automaton in order to get to Venus before the dread French general, Joseph Fouché, the Executioner of Lyon.

Once on Venus, Arabella, Singh, and Fox soon discover that Napoleon has designed a secret weapon, one that could subjugate the entire galaxy if they can't discover a way to stop Fouché, and the entire French army, from completing their emperor's mandate.