It just remains to be seen whether Aurvandil has any honour or not.
The war is entirely about honour, Barca dishonoured Aurvandil in the very heart of our Commonwealth, so Mendicant had his Knight Hausos At Arms suitably dishonour Barca in the heart of their republic, the Senate, which in turn obligates war between us as a matter of honour, which is also why the Knight Hausos rather declared it to be a "duel" in his speech to the Barcan Senate.
Neither, considering they 1) disrespected their border treaty with Barca and 2) are declaring war against them for no reason.
Well, it's not nothing is it? I don't know what Barca expected when they threatened Aurvandil with possible future war, lied, tried to manipulate us, insulted us, dishonoured us and treated us so poorly. Basically, Barca pissed in our cereal one to many times and Aurvandil isn't going to continue putting up with it.
Also, Aurvandil has no border treaty with Barca to disrespect, we only had a verbal agreement of non interference, unless you count the treaty of Evanburg, which doesn't count anyway.