Mercenary is a novel by Piers Anthony published in 1984.
Mercenary is a novel in which Hope Hubris joins the Jovian Navy and becomes part of their task force to eliminate space piracy.
Dave Langford reviewed Mercenary for White Dwarf #69, and stated that "Parts of this are quite sensible, but are balanced by dottiness like the space-battle which – for reasons known only to Anthony – echoes the Mongol invasion of Hungary so faithfully as to neglect the fact that space has three dimensions... Amusing nonsense, but definitely nonsense."[1]