In Eberron during "The Last War" House Deneith, like all dragonmarked houses, remained neutral and sold their services to the highest bidders. But as mercenaries/soldiers this could lead to some unique problems.
While I'm sure House Deneith mercs were expensive, at times it could potentially be more cost efficient to lose them than a country's own citizens/soldiers they'd spent time/$ training and which would still be needed later in the war.
Therefore, if presented a situation where heavy losses would be expected (think D-Day or worse) could they/were they ever ordered to (near) certain death? Was there some sort of financial penalty for mass losses? (This is the only penalty I can think of to prevent such tactics.) For normal mercs this would sound unnecessary but for a proud Dragonmarked house it seems... important/prudent.
Was this or any similar situation ever addressed in any official material?
As splat books appear silent on the issue, knowledge of any published Eberron novels addressing the issue would be the only likely source (if any exists at all... which admittedly it may not). Hopefully there's a bookworm out here with insight to its (non)existence?