Napoleon’s temper was “sudden, fierce, and boisterous” (The Life of Emperor Napoleon, 1834 by Henry Lee).
(“1812” Napoleon I in Russia: With an Introduction by R. Whiteing)
Coupled with his obsessive ambition for power (“Power is my mistress”…http://www.historytoday.com/gemma-betros/napoleon-man), his temper arguably helped bring about his downfall.
For more: What today’s leaders can learn from Napolean: http://www.inc.com/sam-bacharach/what-todays-leaders-can-learn-from-napoleons-mistakes.html