This campaign has become much more complicated than I thought when I was planning the whole thing
Thanks for all feedback, ideas and suggestions.
And thanks for not dropped put of this campaign (yet), I actually feel a bit bad as if I have fooled you to participate in something that's not finished

But I hope we can find solutions to any problems we encounter in the campaign system...
I've been reading you ideas and suggestions, thinking and experimenting a bit and come up with the following:
Maps
Meeting engagements
Map size: 20x30
Turns: 18
Free deployment
Army size: 20 vs 20
I've tested both 20x20 and 20x30. I found that I think 20x30 works best in ME battles and numbers of turns would be 18. I find that's enough on this size.
As you've seen Pete and I have been experimenting with castles and two types of castles: large and small. Most of the castles would be small, only Stockholm and Kalmar are large as they are the two main objectives in the campaign. Attacking castles are supposed to be hard, and in most cases there should be a siege for 1 or 2 phases before the actual attack is done. Walls will be represented by impassable terrain, with a number of gaps representing gates, but also damage done by siege weapons. An undamaged castle has two (or three, Pete and I are still testing) gaps. For each phase of siege another two gaps are added. In addition an undamaged castle has steep hills, while a castle that is under siege will have ordinary hills.
Large castles
Map size: 30x30
Turns: 25
Fixed deployment to allow the attacker to deploy from more than one side.
Army size: 30 vs 25 if attacked without a siege. After 1 phase of siege 30 vs 22, 2 phases of siege 30 vs 19, 3 phases of siege 30 vs 16 etc.
Small castles
Map size: 20x20
Turns: 18
Fixed deployment to allow the attacker to deploy from more than one side.
Army size: 20 vs 15 if attacked without a siege. After 1 phase of siege 20 vs 12, 2 phases of siege 20 vs 9, 3 phases of siege 20 vs 6 etc.
Withdrawing armies and dissolving armies
A. Steve has spotted an error in rule 7.6.6. It should be like Steve writes:
It is obvious that 7.6.6 is meant to read "for that army to withdraw into then the loser's army is dissolved".
My mistake, thanks Steve!
B. I think Steve summarises the situation in Westra Götaland very well:
1. Capture Orebro castle this turn and then retreat to Nerke while your other army occupies the castle. Best solution.
2. Retreat to Nerke while the castle is still in Danish hands and eliminate all the units beyond 35 that exist when the two occupying armies merge.
3. Dissolve and lose half the army and hope to free Westra Gotaland at some later stage.
Option 2 is not something covered by the rules, but the idea is good. It could be a good thing to allow armies to withdraw to a province with a friendly army and merge. It also feel realistic and maybe historical correct, that the survivors of an army seek up another friendly army.
Problem is that if the army of Nerke loses it has to withdraw to a neighbouring province under Swedish control. There's no guarantee there will be a province to withdraw to. It will if army of Gestrikland loses and the army of Dalarna wins, then Dalarna will be free for army of Nerke.
But as army of Nerke is one of the starting armies, starting in Nerke which has a Danish army inside Örebro Castle, it might be a good idea to give the army of Nerke a special rule: If in the opening phase, the army attacks Örebro castle and losing, the army will not withdraw to a neighbouring province. But in all phases after the first it has to. Or, we allow all armies attacking castles and loses to stay in the province but not count as besieging the castle. The latter I think is more realistic.
Regarding option 3, when I read the rules about dissolved armies, it does not say anything about a dissolved army coming back when the province is back in friendly control:
7.7.3 Province armies redeploy in their home provinces. If their home
province is already occupied they will redeploy first when the home
province is unoccupied. If the province has a castle, both the castle and the
province must be occupied for the army not to be able to redeploy.
This would mean that the Danish must stay in the province, otherwise the dissolved army will redeploy and take control of the province again...
When it comes to the 'penalty' for being dissolved. Eliminating half of the remaining army is much. But when playtesting and from your battle in Westra Götaland, even if there was high losses in break points, not many BG's were lost. I think the Danish lost 2 while the Swedish lost 5 in the actual battle. That's not very heavy losses, and I think we need a way of inflicting heavy losses.