The Flower-class corvette was a British class of 294 corvettes used during World War II by the Allied navies particularly as anti-submarine convoy escorts in the Battle of the Atlantic. Royal Navy ships of this class were named after flowers.
HMS Bluebell was a Flower-class corvette that served in the Royal Navy in World War II. Ordered from Fleming & Ferguson of Paisley, Scotland on 27 July 1939, she was launched on 24 April 1940 and commissioned in July 1940. She served in the Atlantic, Mediterranean and Arctic campaigns, escorting several convoys to Russia, and also took part in the invasions of Sicily and France. She was torpedoed and sunk by U-711 in the Kola Inlet on 17 February 1945 while escorting the convoy RA 64 from Murmansk. Only one member of her crew survived.
The first USS Thomas (DD–182) was a Wickes-class destroyer of the United States Navy that entered service just after World War I.
Adrias was a Type III Hunt-class destroyer that was originally built for the Royal Navy as HMS Border but never commissioned. Before her completion, she was loaned to the Royal Hellenic Navy on 20 July 1942 and commissioned as Adrias on 5 August 1942 in order to relieve heavy losses of ships sustained by the Royal Hellenic Navy during the German invasion of 1941 and throughout the war. Adrias took her name from the ancient Greek town of Adria in Italy, at the mouth of the Po river, after which the Adriatic Sea is named.
Vasilissa Olga was the second and last destroyer of her class built for the Royal Hellenic Navy in Great Britain before the Second World War. She participated in the Greco-Italian War in 1940–1941, escorting convoys and unsuccessfully attacking Italian shipping in the Adriatic Sea. After the German invasion of Greece in April 1941, the ship escorted convoys between Egypt and Greece until she evacuated part of the government to Crete later that month and then to Egypt in May. After the Greek surrender on 1 June, Vasilissa Olga served with British forces for the rest of her career.
HMS Leith was a Grimsby-class sloop of the Royal Navy that served in the Second World War.
HMS Peony was a Flower-class corvette of the Royal Navy. In 1943 she was transferred to the Royal Hellenic Navy as RHNS Sachtouris, serving throughout World War II and the Greek Civil War. She was returned to the Royal Navy in 1951 and scrapped in April 1952.
HMS Avon Vale(pennant number L06) was an escort destroyer of the Hunt Type II class. The Royal Navy ordered Avon Vale's construction three days after the outbreak of the Second World War. John Brown Shipbuilding & Engineering Company Ltd laid down her keel at their Clydebank yard on 12 February 1940, as Admiralty Job Number J1569. After a successful Warship Week national savings campaign in February 1942, Avon Vale was adopted by the civil community of Trowbridge, Wiltshire.
HMS Vetch (K132) was a Flower-class corvette that served in the Royal Navy during the Second World War. After helping to escort many convoys and sinking two U-boats, she was decommissioned and sold in 1945.
HMS Salvia (K97) was a Flower-class corvette of the Royal Navy. She was ordered on the eve of the Second World War and entered service in September 1940. She rescued many survivors from the prison ship SS Shuntien when it was sunk on 23 December 1941. A few hours later, on Christmas Eve 1941, Salvia too was torpedoed. The corvette sank with all hands, and all of the survivors that she had rescued from Shuntien were also lost.
HMS Pakenham (G06) was a P-class destroyer of the British Royal Navy built and operated during World War II. Commissioned in early 1942, she took part in the invasion of Madagascar, and several Malta Convoys, before being disabled in a battle with Italian torpedo boats in April 1943 and scuttled.
HMS Coreopsis was a Flower-class corvette, built for the Royal Navy during the Second World War which served in the Battle of the Atlantic. In 1943, she was transferred to the Royal Hellenic Navy as RHNS Kriezis and participated in the 1944 Invasion of Normandy. Shortly before she was scrapped, she took part in the British war film, The Cruel Sea.
At least two ships of the Hellenic Navy have borne the name Apostolis after Greek naval hero Nikolis Apostolis:
HMS Delphinium (K77) was a Flower-class corvette built for the Royal Navy (RN) from 1940-1946. From 1941 to 1943 she was active in the Mediterranean as an escort to convoys supporting the Eighth Army and the invasion of Sicily. From mid-1943 onwards she was on convoy escort duties between Africa, the Mediterranean and the United Kingdom; and Atlantic convoys between North America and the United Kingdom. She escorted a total of 68 convoys.
HMS Alisma was a Flower-class corvette that served in the Royal Navy.
HMS Sunflower was a Flower-class corvette of the Royal Navy. She served during the Second World War.
HMS Dianella was a Flower-class corvette of the Royal Navy. She served during the Second World War.
HMS Tweed (K250) was a River-class frigate of the Royal Navy (RN). Tweed was built to the RN's specifications as a Group I River-class frigate, though Tweed was one of the few powered by a turbine engine. She served in the North Atlantic during World War II.
World War II was the first war where naval aviation took a major part in the hostilities. Aircraft carriers were used from the start of the war in Europe looking for German merchant raiders and escorting convoys. Offensive operations began with the Norwegian campaign where British carriers supported the fighting on land.
Pegaso was a torpedo boat and an escort aviso of the Italian Regia Marina. She was one of the most successful Axis anti-submarine warships of World War II.
United Kingdom
Kingdom of Greece 
