The rival clans of MacGregor and MacKenzie faced off across the field. Nobody remembered the details of their hatred any more. All that remained over the hundreds of years was the foundational idea that no MacGregor could befriend a MacKenzie and vice versa. Their differences, whatever they happened to be, were insurmountable.
The MacKenzie commander raised his sword high. The clan shouted and advanced at a run toward the MacGregor lines. The MacGregors stayed put behind their shields, with spears protruding between them. The archers let loose with a coordinated twanging of bow strings and many MacKenzies were felled or injured. The rest kept coming, leaping over their fallen clansmen where necessary. Their war cry continued to echo through the valley.
A short way off, looking on from behind some bushes, the young boys of both clans sat together, watching intently as their fathers, uncles and bigger brothers fought for clan honour. They didn't know any better than their fathers what their clans fought about - land, some political dispute or something else entirely - and they didn't much care.
They swore to each other that they would never continue such a stupid conflict. They signed scrawled pieces of paper, looked each other squarely in the eyes and shook hands, but behind every back, fingers were crossed.
Mokalus of Borg
PS - These two just suburbs seemed to go together.
PPS - Or to oppose each other nicely.