I have this phenomenon happening and I don't know what's going on. It's so strange that I thought my units were being GMed to 0 morale and disappearing...
Okay two examples but the same thing seems to be occurring:
1) I had two units (only troops, no mech) one 10 strong and the other 4 strong. They were marching along on separate paths to attack a province with a unit 4 strong in it. No bombardment occurred and there are no planes/naval units around. The 10 strong unit dropped to 7 and has significantly decreased moral, and the 4 strong unit disappeared... all before any combat occurred. (this same thing happened in the ocean as well, while attacking the same player several days prior)
2) I had a unit about 6 strong stationed on the shore (just prior to embarking) so i can stand against an army trying to disembark there. Well, without any combat occurring and confirmed no planes or naval units bombarding (checked the enemies killed on unit description) 5 of these 6 units disappeared and the remaining unit has about 30% morale. They started at 100%
Any help or insight to what is happen/what i am doing wrong would be greatly appreciated!