If they do war they'll be slaughtered based on the numbers against them. Their only chance is diplomacy and quickly at that otherwise their top states will suffer.
War is an ugly thing, but not the ugliest of things.
The decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth war is much worse. The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature, and has no chance of being free unless made or kept so by the exertions of better men than himself.