Peace proposes in her complaint that kings submit their grievances to wise and impartial arbiters, and points out that even if the arbiters are unjust neither side will suffer to remotely the extent that they would from war. Perhaps peace must be purchased -- but compare the price to the cost of a war! For the price of destroying a town you could have built one, Peace says.
For arbitration to replace war, Peace says, we will need better kings and better courtiers. You can't get any more timely and relevant than that.