It is entirely possible that the legacy is part of the reason why everyone was willing to make peace with us. They knew that if they fought till the end of the turn they would lose stability. It changes the risk/reward balance.The legacy is explicitly about king of the hill wars, which this war is. It has absolutely no fucking use or advantage in any other context. In short it's a shit legacy, but this is the one day where the stars align and shine just so, making this legacy actually useful. So yes I say we bloody use it, we sacrificed a chance to upgrade we have reserves for it for fuck sake (gee who would av thought we could possibly use a quick martial boost).
And yes I have partaken of a bit of salt.