How to Sack a Divisional Commander: Tewksbury, 4 May 1471;

“Lord Winlock not having advanced to the support of the first line, but remaining stationary, contrary to the expectationsof Somerset, the latter, in a rage, rode up to him, reviled him, and beat his brains out with an axe.”

Max Hastings (1985) from The Oxford Book of Military Anecdotes