He was posted to the battlecruiser HMS Renown in March 1920 and accompanied Edward, Prince of Wales, on a royal tour of Australia in her. He was promoted lieutenant on 15 April 1920. HMS Renown returned to Portsmouth on 11 October 1920. Early in 1921 Royal Navy personnel were used for civil defence duties as serious industrial unrest seemed imminent. Mountbatten had to command a platoon of stokers, many of whom had never handled a rifle before, in northern England. He transferred to the battlecruiser HMS Repulse in March 1921 and accompanied the Prince of Wales on a Royal tour of India and Japan. Edward and Mountbatten formed a close friendship during the trip. Mountbatten survived the deep defence cuts known as the Geddes Axe. Fifty-two percent of the officers of his year had had to leave the Royal Navy by the end of 1923; although he was highly regarded by his superiors, it was rumoured that wealthy and well-connected officers were more likely to be retained. He was posted to the battleship HMS Revenge in the Mediterranean Fleet in January 1923.