There is a town called Huntly right next to Auchindoon, so I would surmise it it more than a revenge story. If the town is named after the man he must have been a big landowner, if the other way around he must have been a lord, either way, it smacks of rebellion rather than personal grudge.

I would be most interested in the full story if anyone has it.

Gallowglasses, by the way, were neither traitor nor spy, they were simply trying to earn a living in a dangerous trade, as poor people have been doing for thousands of years!

We learned extensively about them in primary school history class as they played a huge part in shaping Irish history.