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This is the dreadful logic that comes to control a lot of wars. (The American Civil War is another example.) The losers prolong their agony as much as possible, because they’re convinced the alternative is worse. Meanwhile the winners, who might earlier have accepted a compromise peace, become so maddened by the refusal of their enemies to stop fighting that they see no reason to settle for anything less than absolute victory. In this sense the later course of World War II was typical: it kept on escalating, no matter what the strategic situation was, and it grew progressively more violent and uncontrollable long after the outcome was a foregone conclusion. The difference was that no other war had ever had such deep reserves of violence to draw upon.
The Vikings would have understood it anyway. They didn’t have a word for the prolongation of war long past any rational goal — they just knew that’s what always happened. It’s the subject of their longest and greatest saga, the Brennu-njalasaga, or The Saga of Njal Burned Alive. The saga describes a trivial feud in backcountry Iceland that keeps escalating for reasons nobody can understand or resolve until it engulfs the whole of northern Europe. Provocation after fresh provocation, peace conference after failed peace conference, it has its own momentum, like a hurricane of carnage. The wise and farseeing hero Njal, who has never met the original feuders and has no idea what their quarrel was about, ultimately meets his appalling death (the Vikings thought there was nothing worse than being burned alive) as part of a chain of ever-larger catastrophes that he can tell is building but is helpless to stop — a fate that seems in the end to be as inevitable as it is inexplicable.
