To this end, a crew of 12 prepared a ship that had been seized in Gibraltar. They disguised vertical logs of wood with headwear, to make the Spaniards believe that the vessel was fully crewed. To make it look more heavily armed, additional portholes were cut in the hull and logs placed to resemble cannons. Barrels of powder were placed in the ship and grappling irons laced into the ships rigging, to catch the ropes and sails of "Magdalen" and ensure the vessels would become entangled.