So no casualty?
meaning that the mercenary card will not be lost unless it deserts?
3. Assign Casualties: For each 100 casualties he has
taken, each Baron must assign one casualty token to his
armies. One by one, he assigns the tokens to his armies
involved in the battle. An army may only take as many
casualties as it has troops. If the number of casualties is
ever equal to or greater than the number of troops in the
army, the Noble leading that army dies (see “Noble
Death,” page 18) and no more casualty tokens may be assigned to that army.
When a Noble dies, the following happens:
1. Draw for Deserters: Draw one Fate card. If the
deceased Noble had any Mercenaries of the drawn
nationality assigned to him, the Baron must choose one
Mercenary Troop of that nationality to immediately
desert. (Shuffle it back into the Mercenary deck.)
2. Lose Casualties: For every casualty token on the
Noble’s army, he must discard 100 strength worth of
Mercenaries. If the Noble cannot discard a number of
Mercenaries exactly equal to the casualties, he must discard
as many as possible without going over. Then all
casualty tokens are removed from the Noble. Note that
Regular Troops are never discarded as casualties.
3. Remove the Noble from the board and discard any
offices he held.
It's all in there. You always lose your mercenaries since you cannot take regular troops as losses.