 On December 1939, Weinberg became personally involved in the naval Battle of the River Plate.Omitting his Jewish background and passing as a regular German immigrant, he was approached by the British Embassy and given the mission to feed false information to the crew of the German pocket battleship "Admiral Graf Spee" that an overwhelming British force was being assembled, and that it was futile to attempt to leave Montevideo Bay.Being deceived by the false intelligence, the "Graf Spee"'s captain, Hans Langsdorff, decided to scuttle the ship.