Was Mountbatten's rapid promotion a response to wartime casualties and his being the best available candidate?
Short answerChurchill considered him the best fit, but other candidates existed and repeated political appointments restricted his opportunities to gain experience in naval commands.
NotesChurchill's confidence in Mountbatten carries particular weight in this explanation of his rapid advancement. Other officers were available and were proposed for the appointments. The Royal Navy wanted to give Mountbatten commands appropriate to his rank, yet further political postings intervened. That pattern left an experience gap when he returned to senior naval leadership.