John Erskine, 6th Earl of Mar, standard-bearer for the Jacobite cause in Scotland, mustered Highland chiefs, and on 6 September declared James Francis Edward Stuart (the "Old Pretender") as King of Scots. With an army of about 12,000 men Mar proceeded to take Perth, and commanded much of the northern Highlands. Following unsuccessful skirmishes against John Campbell, 2nd Duke of Argyll (based at Stirling), Mar was eventually persuaded to lead his full army south, on 10 November. Spies informed Argyll of Mar's actions, and he moved his army of about 4,000 to Sheriffmuir, near Dunblane. The two armies met on the battlefield on 13 November.