So I'm building up my empire nicely. I'm King of Wales and Scotland, soon to be King of Ireland, and then slowly move into England – and become Emporer of Britannia. I've done it before (though started off as a Count of Ireland) until I owned 30% of France too, 30% of Hispannia, 25% of the HRE and a bit of Italy. I was happy.
Now I'm doing it again with what I've learned and trying to do better, but Invade Norway once I've made my Empire. However, I've got a Planned Invasion against me. My max army is 10k. They've got 18k. I've got a bunch of alliances but they're through siblings so no one will come help.
I've got 4 daughters and 1 son, but none are age of maturity yet.
Basically, I'm looking for a way not to lose Scotland to what is a mammoth of a Nation of Norway. What do you recommend?