Before heading Self_motion south to lay siege Besieging to Aberdeen Castle , the Bruces laid waste the Earldom of Buchan , including all the castles and strongholds , principally Rattray Castle and Dundarg Castle .

It took Conquering thirty years before John Comyn 's successor to the Earldom , Henry Beaumont , made an appearance in the area .

His son John refused Agree_or_refuse_to_act the Earldom , ending Process_end the Comyn lineage and the first creation , Mormaers of Buchan .

The battle Hostile_encounter was fought Hostile_encounter to resolve Resolve_problem competing Competition claims Statement to the Earldom of Ross , a large region of northern Scotland .