Mission 1 is really easy imo, but there’s a couple of missions later on in the campaign which I found really difficult.
Mission 2 is a bit of a confusing mess. For some reason if you garrison your units here they can’t be retrieved except by destroying the building? Oh well.
Merry Christmas! Mission 3 is an absolute nightmare. I was so relieved when I eventually finished the mission. I definitely started the mission strong but it got super difficult as soon as Darstor started attacking 
I’d love to hear how other people completed this one especially!
Here’s mission 4! I wish the AI would’ve attacked the other two fortresses a little more, might have made it more exciting.
And last, but not least, here’s the finale!