Continuing with lists as extracted from "The Reader's Companion to Military History" with my commentary when warranted.
"Insanity: doing the same thing over and over again and expecting different results." - - A. Einstein.
"The Ten Worst Generals."
* Aicibiades. [Athenian]
* Julian. [Rome]
* Burnside. [Union]
* Sir Douglas Haig. [WW1]
* Nivelle. [WW1]
* Gamelin. [WW2]
* Mark Clark. [WW2/Korea]
* Adolf Hitler. [WW2]
* Chiang Kai-Shek.
* Westmoreland. [Second Indo-China War]
ADOLF HITLER I WOULD CONSIDER TO BE A GENERAL OFFICER AS THAT WORD GENERAL COMMONLY, NORMALLY AND GENERALLY UNDERSTOOD.
Alas, three Americans making the list. Two Frenchmen also.With regard to insanity Ambrose Burnside by the criteria of Einstein perhaps without peer. Marye's Heights. Senseless slaughter without accomplishment and when not needed.