I’ll defer to you.
Most people start with his Flashman books, but if you want a great read, I highly recommend his MacAuslan stories, or the aforesaid Steel Bonnets.
There was nothing meaner than a Johnson or an Armstrong on a bad day.
And I say that as a descendant of the most notorious clan of cattle thieves, kidnappers, and protection men over in the West Highlands - the MacGregors.