[Saxon]

All,

My bad, it turns out there is a good reason for this. Here is what I got on the main forum

Sombre said:
Also - was she a hama dryad or naead or nature spirit of any kind?
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Sounds like it. Those have an effect which is like Disease (doesn't recover HP, loses 1 HP per month) when she leaves her home province. I really think the game should reflect this by showing an affliction when the spirit is suffering from this.

In other words, my unit was going to die, but the game is mildly bugged and does not inform you when they die from this. Sorry for the confusion, I guess that is why this is a newbie game. Many thanks for your replies, some of which included information that was confidential. On the plus side, you all now know my plan!