Eventually she acquiesced, and one of the soldiers knocked Jamie out and tied him up in the wagon. The girl's response provoked Randall into holding his dagger against Jamie's throat. When he'd finished, Randall taunted the sister, inviting her to take him inside the house to spare Jamie. Randall's men stripped off Jamie's shirt and bound him to their wagon, whence Randall beat him across the back with the flat of his saber. After hearing his sister, Jenny, in distress, nineteen-year-old Jamie Fraser attempted to defend his sister and his property, but soon gave it up when Randall pointed a pistol at the young woman's head. With a levy imposed on the farms surrounding Fort William to oblige officers with supplies and food for the garrison, Randall and his men were on such a mission in October 1740 when they stopped at Lallybroch, and met resistance from its inhabitants. In late 1739, he became garrison commander at Fort William, succeeding Captain Buncombe. In the 1735, Randall bought his commission and served as a captain of dragoons.
His elder brother, Edward Randall, inherited the family estate in Sussex, while his younger brother, Alexander, became a curate. His father was knighted in the late 17th century, and was awarded a baronetcy by King George I.
Jonathan was the second son of Sir Denys Randall and Jessica Wolverton.