The fact of battleship sinking was indisputable .
Mitchell repeated the performance twice in tests conducted with like results on the obsolete U.S. pre-dreadnought battleship Alabama in September 1921 , and the battleships Virginia and New Jersey in September 1923 .
The fact of battleship sinking was indisputable , and Mitchell repeated the performance twice in tests conducted with like results on the obsolete U.S. pre-dreadnought battleship Alabama in September 1921 , and the battleships Virginia and New Jersey in September 1923 .