Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Admiral Sir Ragnar Musgrave Colvin KBE, CB (1882â€“1954) was a long-serving British naval officer who commanded the Royal Australian Navy (RAN) at the outbreak of the Second World War. Colvin joined the Royal Navy as a cadet in HMS Britannia in 1896, was commissioned lieutenant six years later and, after qualifying as a gunnery specialist in 1904, was promoted Commander in 1913. In World War I he served as Executive Officer in the cruiser Hibernia, and in the battleship Revenge in which he served in the Battle of Jutland. Promoted Captain on 31 December 1917, he served in the Admiralty as Assistant Director of Plans and was appointed CBE. After the war Colvin commanded the cruiser Caradoc in the Black Sea and the Mediterranean; in 1922-24 he was Naval AttachÃ© in Tokyo.