The Frontline Grenadiers are the 35th Regiment of Foot latterly the Royal Sussex. After their engagement with the Royal Roussillon they were nicknamed the Orange Lillies.
The folowing is an extract from a website dedicated to the regiment which I hope you find interesting, additionally, there is a thread on the TF Frontline forum which adds some more detail........
The County Regiment has served with great distinction on many occasions, probably the most celebrated of which was the battle of Quebec, where, on 13th September 1759, the Regiment took part in the action on the Heights of Abraham, defeating the French Royal Roussillon Regiment. “In recognition of the Regiment’s fine discipline in that battle authority was given for it to wear the white plume of the Royal Roussillon Regiment. The 35th also took from this regiment their colours, which bore the French lilies of gold, and from this originated the nickname “The Orange Lilies”. The white plume the 35th bore on their hats for forty years afterwards”[1], and was eventually to be commemorated in the badge worn by the Regiment until 1966. Thus the Regiment played its part in General Wolfe’s great victory, and at the same time, were present at the death of the French Marquis de Montcalm, avenging the earlier massacre of the 35th at Fort William Henry, by the North American Indians, allies of the French who had been commanded by Montcalm, the story of which was immortalised in ‘The Last of the Mohicans’.