Pyrrhic victory

A Pyrrhic victory is a victory with devastating cost to the victor. The phrase is an allusion to King Pyrrhus of Epirus, whose army suffered irreplaceable casualties when he defeated the Romans during the Pyrrhic War at Heraclea in 280 BC and Asculum in 279 BC. After the latter battle, Plutarch relates in a report by Dionysius:

In both of Pyrrhus's victories, the Romans lost more men than Pyrrhus did. However, the Romans had a much larger supply of men from which to draw soldiers, so their losses did less damage to their war effort than Pyrrhus's losses did to his.

The report is often quoted as "Another such victory over the Romans and we are undone." While it is most closely associated with a military battle, the term is used by analogy in fields such as business, politics, law, literature, and sport to describe any similar struggle which is ruinous for the victor.