21 August 1689: At the battle of Dunkeld the Jacobites under the command of Brigadier-General Alexander Cannon attacked a Scottish government force of Cameronians, commanded by Lieutenant-Colonel William Cleland, in and around the town of Dunkeld. The brutal urban fighting would see most of the town destroyed.
21 August 1745: Charles Edward Stuart and his highland army set off from Glenfinnan to Kinlocheil.
21 August 1754: The birth in Lugar, Ayrshire of Scottish chemist, inventor, and mechanical engineer William Murdoch.