mmm... Good attempt!... but I don't buy it! 
I think you really had a big indigestion of falk propaganda! Aurvandil is in Fissoa because the falkirkians were collapsing... Your presence in Fissoa only shows Flakir? is a puppet state... Not that we didn't know it already! 
Falkirk didn't attack Fissoa because we were preparing to jointly take down Fissoa. Falkirk got told at the last minute, Mendicant turned round to Lex and said "My armies are on the move to fight Fissoa, so that's happening". Falkirk as a puppet state, well you realise Aurvandil wouldn't even be fighting with Falkirk right now if people didn't keep saying that? Because everyone assumed Falkirk was a puppet, they went on and on about how they're going to destroy Falkirk and conquer it after Aurvandil and how they're Orvandeaux. Which had the affect of making our enemies, their enemies, forcing us both to the same side.
I don't know, if people had a bit more tact about things then Falkirk wouldn't have been made enemies of the same people who are trying to destroy Aurvandil. Putting Aurvandil in a weaker position. You basically got two of the best militarise to join together when they didn't want to, at all and rather treated each other with indifference (We still do). Lets see how that works out for you. It's given Fissoa quite the beating already.
I can almost see the fall of Mendicant. Can't wait for it.
Sorry mate, that's just not going to happen.
You underestimate just what Aurvandil is capable of. We went into this war with a mindset of delaying our foes militarily to have a chance to negotiate, but as we've lost all chance of negotiations we're fully free to max our our military (which, with 60 nobles is over 4,000 mobile soldiers plus militia, as the upper tier of our limits) and then use it.
Your swords will be pointed in the same direction as long as you ignore Mendicant. His tongue is like poison.
Thank you. Sincerity can do that to a man when he speaks.
As Rynn said, Mendicant has a certain amount of "purity" and sincerity when he bothers to write letters that is rather endearing.
