Signalling the report of the sighting to the three ships in the small convoy, U.S. Navy cargo ship USS Munindies ID-2093 2 , and merchant ships SS Florence H. 2 , and SS Thorvald Halvorsen 2 —Wakiva II commenced fire with number two and four 3 inches guns, checking fire momentarily to avoid hitting Florence H., which was steaming just beyond where the enemy submarine had suddenly appeared.