In December 1741
Tyger was assigned to blockade duty off the western tip of
Cuba, under the command of
Captain Edward Herbert. He had learned from the captured crew of a small Cuban sailing vessel (a
periagua) that Spanish ships were preparing to sail in both directions between
Havana, Cuba and
Vera Cruz, Mexico. Early in 1742, eager to capture a valuable
prize, Captain Herbert left his assigned station to move closer to the expected path of the shipping between Havana and Vera Cruz. On 11 January, the
Tyger approached low-lying islands. The officers became confused, first correctly identifying the islands as the Dry Tortugas, and then mistakenly identifying them as the Reques Keys on the
Grand Bahama Bank. That night the ship grounded on a reef. The ship was successfully backed off the reef, but there was no anchor ready to be dropped, and the ship ran upon the reef again, this time for good. The ship's crew transferred to Garden Key, taking food and water with them. A rumor spread among the men that, since the ship was wrecked and they were on dry land, they were free of naval discipline. Captain Herbert told the men that they were still under naval authority, and that all needed to work together to save themselves. A camp was established on the island, using sailcloth for tents to shelter men and supplies. On 18 January, the ship's
longboat, with nine men, sailed for
New Providence in
the Bahamas to seek help for the stranded crew. The voyage was expected to be short, as the officers still believed they had wrecked on the Reques Keys, in the Bahamas. Fearing discovery by the Spanish, Captain Herbert had the 9-pounder and 6-pounder guns moved to the island from the ship and installed on newly constructed gun platforms. The 18-pounder guns were raised from the main
deck (which was now at the waterline of the partially sunken ship) to the upper deck, so that they could be used to defend the camp on the island. Three weeks after the longboat left, the ship's
yawl, with eight men under the command of Second Lieutenant Craig, also sailed to seek help from New Providence. After sailing about , the yawl reached what Lieutenant Craig recognized as the "islands of Cape Florida" (the upper
Florida Keys), where the yawl encountered some Spanish boats. A Spanish
sloop chased the yawl, and Lieutenant Craig decided to return to Garden Key. Captain Herbert immediately sent a force of seamen and marines to try to capture some of the Spanish boats. The expedition found an abandoned, heavily damaged sloop which they were able to sail back to Garden Key. ==Discovery by the Spanish==