On the vow of the British commander not to be moved. I will have to read up on this, but think you may have another battle. Could have been Sir Edward Pakenham at the Battle of New Orleans 1815. Contrary to the Johnny Horton song, the British did not "run like rabbits". They suffered ten times the American losses and Pakenham was killed.
Colonel Ferguson was blowing his silver whistle which was to signal his men to rally. Six small arms shots killed him.
Thanks for your input. The Wikipedia description describes Ferguson as being killed by sharpshooters; the fellow interviewed named his ancestor that he claimed killed him in such fashion.