In June 1940 Italy joined the war against the Allies, and the Royal Navy commenced operations against the Regia Marina. On 16 June Moonstone rescued the crew of the Norwegian tanker James Stove which had been sunk by the Italian submarine earlier that day. On 18 June Galileo Galilei was sighted and attacked by British aircraft, and Moonstone was dispatched to find her. On 19 June Moonstone obtained an ASDIC contact and attacked, dropping two depth charges. The submarine's captain, realizing his opponent was smaller and less heavily armed, and troubled by an escape of poisonous fumes in the boat, chose to fight on the surface, where he would still have the advantage. Breaking the surface Galileo Galilei’s crew manned her guns and got off the first shot, but this missed; Moonstone bore down and fired, hitting the submarine's bridge and killing or wounding the bridge crew, including her captain. Unable to continue, Galileo Galilei surrendered and was taken in hand by the trawler. Later, the destroyer joined up, and took the submarine in tow to Aden. The submarine had suffered 12 killed and 4 wounded; Moonstone had no casualties. For this effort Moonstones skipper, bosun William Moorman, was awarded the DSC and referred for an officer's commission. PO Frederick Quested, in charge of the gun crew, received the DSM.War IllustratedWarsailors
