Monstrous Regiment

War has broken out again on Terry Pratchett's Discworld and, to no one's surprise, it is started by the small, insufferably arrogant, ferociously patriotic duchy of Borogravia, which prides itself on its ability to beat up on its neighbors even for the tiniest imagined slight. But the country is rapidly running out of young men to carry on the fight, so Sergeant Jackrum is inclined not to notice when Polly Perks dons her brother's clothes, stuffs a pair of socks down her pants, and enlists in the hopes of finding her missing brother. With no training, «Oliver» Perks is sent off with a regiment that includes a vampire (off the blood), a werewolf, and an Igor — very handy for stitching legs and such back on.