AHHHH
my stupid SC got killed because my cheap army retreated into the water rather then get back on the boat that brough them there!
I originally thought grabing a costal province that didn't connected to my other provinces except by boat would be a good idea, cos if it got taken my an enemy, they wouldn't normally be able to continue their raid on my other provinces. But without knowing what I was fighting, I didn't script my pretender's spells properly, and he kept casting Blade Wind instead of Thunder Strike.. when my troops finally got charged by the heavy cavalry, they all rooted and everyone died in a horrible death as they tried to swim home.
But they had a boat to carry them all home! Why didn't they sail? (its not like the enemy burnt my boats before the battle, or does losing as battle mean they no longer have access to their boats?!!)