Clan Mackenzie in the 13th and 14th centuries, terminated in the heiress Margaret del Ard, the Lady of Erchless, who married Alexander Chisolm of Cromer c.1350. In the 14th century during the Wars of Scottish Independence the Clan Mackenzie is said to have been among the clans who fought on the side of Robert the Bruce at the Battle of Inverurie (1308) against the forces of the Clan Comyn who were rivals to the throne. Chief Iain Mac Coinnich is said to have led a force of five hundred Mackenzies at the Battle of Bannockburn in 1314 where the English were defeated.
Robert the Bruce planned a major military campaign with the support of Lancaster and the barons, mustering a large army of between 15,000 and 20,000 men. In the spring of 1314, Edward Bruce laid siege to Stirling Castle, a key fortification in Scotland whose governor, Philip de Mowbray, agreed to capitulate if not relieved before 24 June 1314. In March, James Douglas captured Roxburgh, and Randolph captured Edinburgh Castle, while in May, Bruce again raided England and subdued the Isle of Man. News of the agreement regarding Stirling Castle reached the English king in late May, and he decided to speed his march