The Probert Encyclopaedia of Warfare

ROYAL SCOTS FUSILIERS

The Royal Scots Fusiliers are a British army regiment first formed in Scotland in 1678 by the Earl Of Mar, and originally known as the Earl Of Mar's Fusiliers - and by the nickname of the Earl of Mar's Grey Breeks on account of their grey breeches - and later called the 21st Regiment Of Foot. They were transferred to an English establishment in 1689 under the name of the 21st Royal North British Fusiliers and received the title of Royal Scots Fusiliers in 1877.
Research Royal Scots Fusiliers