It is true that according to Dwyer the only battles Napoleon had a hand in were defeats, all victories were either won by subordinates or lost by opponents.

Interesting.

There is as you know a school of thought which holds that NB's defeats - insofar as they acknowledge any - were entirely due to the ineptitude or treachery of his subordinates.

Most probably the truth lies in between. Reviewing the book in question might provide an interesting "compare and contrast" exercise.