The French and Indian War, 13 September 1759.
The French Royal-Roussillon Regiment breaks during the battle on the Plains of Abraham, Quebec.
A site on Ticonderoga, but still about the same regiment: http://www.britishbattles.com/battle_of_Ticonderoga.htm
And, oddly enough, a capsule history of the Roussillon's by a British regiment: http://www.royalsussex.org.uk/RSLHG_Explanation_of_the_name_Roussillon.htm
And, an interesting site on the French-Indian War: http://www.militaryheritage.com/7yrswar.htm