In a few ships the design was altered long after the ship was launched and in service. In the Royal Navy, smaller two-deck 74- or 64-gun ships of the line that could not be used safely in fleet actions had their upper decks removed (or "razeed"), resulting in a very stout, single-gun-deck warship called a "razee". The resulting razeed ship could be classed as a frigate and was still much stronger. The most successful razeed ship in the Royal Navy was HMS "Indefatigable", commanded by Sir Edward Pellew.