Clan Sinclair to St Briavels Castle, and in 1296 he swore fealty to Edward I of England. In 1303 the Battle of Roslin took place where Scots under Henry Sinclair of Rosslyn and the Clan Comyn defeated an English force. The Battle of Loudoun Hill took place in 1307 where Scots under Robert the Bruce, assisted by Henry Sinclair of Rosslyn again defeated the English. The family initially favoured John Balliol's claim to the throne but later it became paramount that they gave their loyalty to Robert the Bruce. The Battle of Bannockburn was fought in 1314, where the Clan Sinclair fought
Battle of Allt Camhna they were guilty of treachery, which is much worse than a defeat. The day and place were fixed for their meeting the Caithness men, and they did not appear, but allowed those to be cut down by a host which had laid their accounts to have the combined forces of Caithness and Sutherland to contend with"". 17th-century historian Sir Robert Gordon (1580–1656), who was living at the time of the battle and who was a younger son of Alexander Gordon, 12th Earl of Sutherland, wrote an account of the battle in his book "A Genealogical History of the Earldom of