At this point the controversy should have ended in favor of Roach .
Now a staunch opponent of Isherwood 's engineering department , Vice-Admiral David Dixon Porter , decided to use it as a means of discrediting Isherwood .
At this point the controversy should have ended in favor of Roach but now a staunch opponent of Isherwood 's engineering department , Vice-Admiral David Dixon Porter , decided to use it as a means of discrediting Isherwood .