During the Wars of the Three Kingdoms Sir George Buchanan commanded the Stirlingshire Regiment and led the clan at the Battle of Dunbar (1650) on the side of the Scottish Covenanters. He later led the clan at the Battle of Inverkeithing but here he was captured and died in captivity later the same year. It is claimed that in Buchanan's Stirlingshire Regiment "most of his officers, and a good many of the soldiers" were of the name Buchanan, and that at the Battle of Inverkeithing a "vast number of the name Buchanan" died. Other Buchanans involved with the Royalist cause include: