Nope- wasn't Jones - an infantryman who had a 'heart attack' ( again, supposedly - an explanation that may well have been given to help preserve the reputation of a very well-meaning officer who is one of the Bulge's tragic figures, put in an almost impossible position way beyond his experience ).
Fair point - I don't 'know' ; the key word in my original question was
reputedly - MacDonald, after all, is not the only historian to have written about the Ardennes Offensive....
One final give-it-away clue - he was known as the 'Sergeants' General'....