Morris was midshipman on the Wager, one of Commodore Anson's fleet sailing up the coast of South America. When the ship was lost, Morris and two companions attempted to return to England via Brasil.
From the description of A narrative of the dangers and distresses which befel Isaac Morris and seven more of the crew belonging to the Wager storeship, which attended Commodore Anson in his voyage to the South Sea : containing an account of their adventures after they were left by Bulkeley & Cummins, on an uninhabited part of Patagonia in South America, where they remained about fifteen months, till they were seized by a party of Indians ... : Interspersed with a description of the manners & customs of the Indians in that part of the world ... : the whole serving as a supplement to Lord Anson's voyage : holograph manuscript / by I. Morris, late midshipman of the Wager. Printed at Dublin for G. & A. Ewing, 1752. (University of California, San Diego). WorldCat record id: 19281662
