The fastest way to kill the daimon comanders would be through a duel to the death. If your character is skilled enough and if they accept of course.
Which they won't, because they don't speak English/Battlemaster Common Tongue (German?) and don't have anything resembling honor. No, you need your good buddy, Infiltrator Guy. You need Skiarxon Guldan. When you absolutely, positively need to stab the !@#$ out of a general in the middle of tens of thousands of CS of troops, accept no substitutes.