Cadmean victory

Yet he who thought he ought to have a Cadmean victory, carried on his conquest.

It would be a Cadmean victory in which the victor would suffer as much as the vanquished.

So it is that partly conquering and partly defeated, sometimes gaining the mastery over others and again falling prostrate themselves, some are altogether annihilated and others gain a Cadmean victory, as it is called, and at a time when the knowledge can avail them nothing they perceive that their plans were ill drawn.

With averted face she held out the envelope, then the curtain fell; and in solitude the aching heart went over the fatal field, silently burying its slain hopes, realizing the bitterness of its Cadmean victory.