I keep waiting for less wordy people to answer this so I don't have to figure out how to get my point across.
I feel that charisma in your example, would be the ability to lead or convince others into setting that ambush, whether or not its a good idea (which would likely be determined by intelligence). An intelligent and experienced character that *knows* it's retarded, but just doesn't work well with others and isn't so easily welcomed and trusted by strangers may have a better plan that is passed up simply because he didn't have the force of character that a highly charismatic individual does.
Edit- Oh, well, wait no longer. Bad timing as usual for me.
