A Biographical Dictionary of the Celebrated Women of Every Age and Country/March, (Agnes, Countess of)
MARCH (AGNES, COUNTESS OF),
A Scotch heroine, called by her countrymen, Black Agnes, defended the castle of Dunbar successfully against the English, in about 1340. When a bulwark was battered by them, she would order her waiting-maids to brush off the dust with their handkerchiefs; and when a dreadful engine approached, "Montague," she cried to the English commander, "beware!" and straightway it was crushed by an enormous mass of rock.
Andrew's Great Britain.