Here is Tristan's save. I'm posting myself because he wanted to ask me some questions first, and agreed to allow me to do so if it was faster. I'm repeating the answers I gave here incase they are helpful.

1. You cannot recuit soldiers are hire mercenaries when your personal treasury is in the red. This is to mimic that fact that in a single-player campaign you cannot do so when the factions treasury is in the red.

2. When your soldiers are under siege in a PvP war without you, you can have them fight to the death, just as in an SP campaign. This is resolved by having the opposing player attack the settlement in a custom battle against the AI.

3. You can disband your soldiers when they're stuck in a settlement undersiege, just like in an SP Campaign.

I'm glad he asked these questions, as they allow me a illustrate my primary design principal for PvP wars: They function exactly like wars against the AI whereever possible.

Not-quite-incidentally, Duke Magnus has ordered his soldiers in Hamburg to disband and return to thier homes! Without any soldiers in the castle, Duke Hummel's men have automatically entered the settlement! Ignoramus must inform me whether he wishes to occupy, sack or exterminate Hamburg before the end of the turn.