Wasp, by Eric Frank Russell, is one of my favorite books of all time.
The Terrans are embroiled in an interplanetary war with the Sirian Empire. As the war draws on and the death toll rises, they realize they can't win in a fair fight. They send a secret agent, James Mowry, to wage a one-man war on an entire Sirian planet. Mowry does this by committing various acts of civil disobediance and terrorism. In fact, he does very little himself; he lets the planet's government do most of the work.
By striking fear into the hearts of the populace and prompting the government to heighten security to paranoid levels, he sets a machine in motion that does virtually all his work for him. Then, when things have gotten so out of hand that the government is fighting its own people and vice versa, the Terran fleet swoops in and finishes the job.
We're losing, and we're so blind and stupid that we're actually happy about it.