Some leader called ‘Keppoch’, Captain Windham heard, had then called on the Royals to surrender, or they would be cut to pieces, and to save his men Captain Scott had done so. Immediately on this had come up Ewen Cameron’s chief, Lochiel (who had been asked for assistance), with a number of his clan, including the present narrator, had taken charge of the prisoners, and marched them off to his house of Achnacarry.

I realize now that "the present narrator" was possibly meant to be Ewen? None of that is quoted speech, so I took "the present narrator" to be the omniscient narrator.