"The Braes of Mar" is an 18th century Scots tune (Bremner's Reels, c 1758, McGlashan's, 1786), but there is seems to be no known song to it, at least until after Hogg's 'Jacobite Relics', 1821.

There is another possibility. Is it perhaps the one called the Highland Muster Roll, or the Chevalier's Muster Roll. It starts "Little what ye wha's coming." That was from the rebellion of 1715.