Pyrrhic Victory
From Star Trek : Freedom's Wiki
A victory that is offset by staggering losses. This expression alludes to Kind Pyrrhus of Epirus, who defeated the Romans at Asculum in 279 CE, but lost his best officers and many of his troops. Pyrrhus then said: "Another such victory and we are lost." In English the term was first recorded (used figuratively) in 1879.
