My recollection, from the account of Invernahyle himself, was as stated in the text.

But the period when I received the information is now so distant, that it is possible I may be mistaken.

Invernahyle was rather of low stature, but very well made, athletic, and an excellent swordsman.
The combat lasted till Rob received a slight wound in the arm, which was the usual termination of such a combat when fought for honour only, and not with a mortal purpose.

Rob Roy dropped his point, and congratulated his adversary on having been the first man who ever drew blood from him.
The victor generously acknowledged, that without the advantage of youth, and the agility accompanying it, he probably could not have come off with advantage.
This was probably one of Rob Roy's last exploits in arms.

The time of his death is not known with certainty, but he is generally said to have survived 1738, and to have died an aged man.