The clans met initially at Knock Mary, a hill on the south bank of the
River Earn between the river and
Drummond Castle. At first the Murrays were winning, but the battle was turned by the arrival of Campbells from Dunstaffnage under Duncan Campbell, McRobbies from Balloch and Faichneys from Argyllshire. Campbell had come to Strathearn to avenge the Murrays' recent murder of his two brothers-in-law and father-in-law, Drummond of Menie. Traditionally the dead from this battle were believed to be buried in the cairn of Rottenreoch, Having fled the battlefield, the Murrays crossed the River Earn and took refuge in the
Kirk of
Monzievaird, about a mile north of the river. Drummond was happy to let them go, but as Campbell returned home, an arrow fired from the church killed one of his men. In revenge the church was burned to the ground, killing those inside. Reports on casualties vary between 120 and 160 Murrays. This became known as the
Massacre of Monzievaird. ==Aftermath==