Who are the men they run into?

When day dawned, they had traveled far enough from danger to stand upright. They were so exhausted, however, that they stumbled dumbly into an ambush. Alan was walking in the lead when suddenly three or four men jumped out, knocked them down, and held dirks to their throats. David was too tired to be scared. Alan spoke to them in Gaelic. The men were from the Vourich clan led by Cluny Macpherson, who had played a large role in 1746. While a messenger ran off, Alan slept but David could not rest because of the grasshoppers' chirping. When they had to move again, David looked so weary that two Cluny men carried him into Ben Alder.