OMAHA was my guess, too.
I wasn't familiar with the Odenwald incident, but it seems like a great nautical adventure!
Here's one telling that I condensed from several sources:
Just prior to the U.S. entry into World War II on November 6, 1941, while on neutrality patrol with USS SOMERS (DD–381) in the mid-Atlantic near the Equator (00°40'N, 28°04'W), OMAHA came across a darkened ship that acted suspiciously when challenged. She flew the American flag and carried the name Willmoto of Philadelphia on her stern, but she refused to satisfactorily identify herself, and aroused suspicion by taking evasive action. The stranger was ordered to heave to, and OMAHA prepared a boarding party.
As the OMAHA crew dispatched the boarding team and approached the stranger, the freighter’s crew took to lifeboats and hoisted a signal which indicated that the ship was sinking. When the party pulled alongside they could hear explosions from within the hull, while one of the fleeing crewmen shouted "This is a German ship and she is sinking!"
The cruiser's SOCs and her accompanying destroyer screened the operation while the salvage crew -- despite extreme danger -- secured the vessel and rendered her safe. Joined by a diesel engine specialist from SOMERS, they soon had the raider underway.
Caption: Odenwald Incident, November 6, 1941, view shows boarding party from USS Omaha (CL-4), heading towards the Willmoto (Odenwald), which had been ordered to heave to. Note crew is armed with Thompson sub-machine gun. Caption: USS OMAHA (CL-4), right, standing by the German blockade runner Odenwald, which has a U.S. boarding party on board, in the South Atlantic, 6 November 1941. Photographed from USS SOMERS (DD-381).[/url]
The ship proved to be the German blockade runner Odenwald, bound for Germany with 3,857 metric tons of raw rubber in her holds. Her capture was one of the great dramas of American seamanship.
The three ships proceeded to Trinidad to avoid possible complications with the Brazilian government if they returned to their base at Recife, Brazil. Because the American ships were nearing the end of a 3,023-mile neutrality patrol, fuel became an issue. Somers's crew ingeniously rigged a sail that cut fuel consumption sufficiently to allow her to reach her destination with fuel to spare.
Caption: USS OMAHA/ODENWALD Incident during World War II. Sailors stowing "sail" rigging for down-wind movement fuel-saving experiment.Odenwald was escorted to San Juan, Puerto Rico by the two warships and delivered to U.S. authorities. The picture below shows OMAHA tied up at N.A.S. San Juan on November 17, 1941.
Caption: USS OMAHA (CL-4) in San Juan delivering the captured German blockade runner ODENWALD[/url]
The Odenwald capture is reportedly the last time that the US Navy awarded prize money to their crews as a result of a capture at sea.
Caption: Crewmembers of USS Omaha (CL-4) pose with U.S. and German flags, on board the captured German blockade runner Odenwald, in the South Atlantic. Life rings are present bearing the names Odenwald of Hamburg, and Willmoto of Philadelphia. The German ship had attempted to disguise herself as the Willmoto, an American-flag merchant steamer. Odenwald was captured by Omaha and USS SOMERS (DD-381) on 6 November 1941. This photograph is dated 18 November 1941.And now you know… the rest of the story…
(Just in case you wondered…)