Clan Turnbull is a Scottish clan.
A legendary account of the Turnbull name was told by Hector Boece, in his History of Scotland. Boece tells the legend that during the Wars of Scottish Independence William of Rule saved King Robert Bruce by wrestling to the ground a bull that had charged at the King. For this feat, the King rewarded William with the lands of Philiphaugh, now part of Selkirk, and dubbed Rule "Turnebull" (the "e" was later dropped from the name).
It seems more probable, however, that Turnbull is derived from the Old English Trumbald or French Tumbald (meaning "strong and bold"), or that Robertus de Turnbulyes, who swore fealty to King Edward I of England in 1296, could be the family father.
Despite the dispute over the origin of the Turnbull name, historians agree that:
The Turnbulls were to become one of the most turbulent of the Borders families. A Scottish nobleman, sent to see if the Turnbulls would back their claim to the throne, reported back that they had no care at all for politicians but always yearned for a fight.
Before the Battle of Halidon Hill in 1333, a champion on the Scottish side, a huge man named Turnbull, accompanied by a huge black mastiff, approached the English host and challenged anyone to single combat. Sir Robert Benhale, a Norfolk knight, answered the challenge and killed both Turnbull and his dog. Benhale returned to the English host, bearing Turnbull's head as a trophy.
Major Gordon Turnbull led the vicious counterattack on the French Cavalry by the 2nd Scots Greys at Waterloo. Though outnumbered some 2-1, the Scots broke Napoleon's famed cavalry, and the Greys destroyed most of Napoleon's legendary Nogue's brigade, resulting in the capture of the eagle of the 45th Ligne. According to Wellington, they "had little tactical ability or nous"[common sense], "but fought like raging bulls". This was taken as a compliment by their Turnbull leader, whose son, brother and three cousins rode into battle: five were wounded and one died. James Hamilton, overall commander of the Greys and the other Scottish cavalry regiment (who were supposed to form a reserve), ordered a continuation of the charge to the French Grande Batterie. Though the Greys had neither the time nor means to disable the cannon or carry them off, they put many out of action as the gun crews fled the battlefield. Some historians note that this action had a very direct outcome on the battle itself.