The fourth chief of Clan MacDougall married a sister of John Comyn II of Badenoch (the "Black Comyn"), whose son, John Comyn III (the "Red Comyn") was stabbed to death by Robert the Bruce in the church of Greyfriars in Dumfries in 1306, and this brought the MacDougalls into conflict with the Bruces. The MacDougalls who had supported William Wallace in the cause of Scottish independence now found themselves in a blood feud with the Clan Bruce, whose cause was also of Scottish Independence. Shortly after Robert the Bruce's coronation at Scone he was forced by the English to retreat into Argyll, in an attempt to reach his Clan Campbell allies. However, the Clan MacDougall surprised the Bruce and defeated him in what was known as the Battle of Dalrigh. The king escaped but left behind what was described as a magnificent example of Celtic jewellery, known as the "Brooch of Lorne" and it became one of the Clan MacDougall's great treasures. Three years later Robert the Bruce led three thousand battle hardened veterans into Argyll against the MacDougalls. John MacDougall of Lorne set an ambush for them but in the ensuing Battle of the Pass of Brander the MacDougalls were defeated and forced to flee. The MacDougalls' lands were then forfeited by the king and he gave them to the Campbells for their loyalty.