Context: During the First World War, following a suggestion from three junior officers of the Harwich destroyer force that small motor boats carrying a torpedo might be capable of travelling over the protective minefields and attacking ships of the Imperial German Navy at anchor in their bases, the Admiralty gave tentative approval to the idea and, in the summer of 1915, produced a Staff Requirement requesting designs for a Coastal Motor Boat for service in the North Sea., The Imperial German Navy ("Imperial Navy") was the navy created at the time of the formation of the German Empire. It existed between 1871 and 1919, growing out of the small Prussian Navy (from 1867 the "Norddeutsche Bundesmarine"), which primarily had the mission of coastal defence. Kaiser Wilhelm II greatly expanded the navy, and enlarged its mission. The key leader was Admiral Alfred von Tirpitz, who greatly expanded the size and quality of the navy, while adopting the sea power theories of American strategist Alfred Thayer Mahan. The result was a naval arms race with Britain as the German navy grew to become one of the greatest maritime forces in the world, second only to the Royal Navy. The German surface navy proved ineffective during World War I; its only major engagement, the Battle of Jutland, was indecisive. However, the submarine fleet was greatly expanded and posed a major threat to the British supply system. The Imperial Navy's main ships were turned over to the Allies, but then were sunk at Scapa Flow in 1919 by German crews., The English Channel ("the Sleeve" [hence ] "Sea of Brittany" "British Sea"), also called simply the Channel, is the body of water that separates southern England from northern France, and joins the southern part of the North Sea to the rest of the Atlantic Ocean., England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west. The Irish Sea lies northwest of England and the Celtic Sea lies to the southwest. England is separated from continental Europe by the North Sea to the east and the English Channel to the south. The country covers five-eighths of the island of Great Britain (which lies in the North Atlantic) in its centre and south; and includes over 100 smaller islands such as the Isles of Scilly, and the Isle of Wight., Scotland (Scots: ) is a country that is part of the United Kingdom and covers the northern third of the island of Great Britain. It shares a border with England to the south, and is otherwise surrounded by the Atlantic Ocean, with the North Sea to the east and the North Channel and Irish Sea to the south-west. In addition to the mainland, the country is made up of more than 790 islands, including the Northern Isles and the Hebrides., The Celtic Sea (; ) is the area of the Atlantic Ocean off the south coast of Ireland bounded to the east by Saint George's Channel; other limits include the Bristol Channel, the English Channel, and the Bay of Biscay, as well as adjacent portions of Wales, Cornwall, Devon, and Brittany. The southern and western boundaries are delimited by the continental shelf, which drops away sharply. The Isles of Scilly are an archipelago of small islands in the sea., The Isles of Scilly (or "") are an archipelago off the south western tip of the Cornish peninsula of Great Britain. It is the southernmost location in England and the United Kingdom, as well as the most westerly in England., Great Britain, also known as Britain , is a large island in the north Atlantic Ocean off the northwest coast of continental Europe. With an area of , Great Britain is the largest European island and the ninth-largest in the world. In 2011 the island had a population of about 61 million people, making it the world's third-most populous island after Java in Indonesia and Honshu in Japan. The island of Ireland is situated to the west of it, and together these islands, along with over 1,000 smaller surrounding islands, comprise the British Isles archipelago., Wales is a country that is part of the United Kingdom and the island of Great Britain. It is bordered by England to the east, the Irish Sea to the north and west, and the Bristol Channel to the south. It had a population in 2011 of 3,063,456 and has a total area of . Wales has over of coastline and is largely mountainous, with its higher peaks in the north and central areas, including Snowdon, its highest summit. The country lies within the north temperate zone and has a changeable, maritime climate., HM Coastal Motor Boat 4 was one of a large series of small , fast , shallow draught Coastal Motor Boats used during the First World War . She was designed by John I. Thornycroft & Company of Hampton , England , ordered in January 1916 , built by them and delivered that summer . CMB 4 was 45 feet ( 14 m ) long and 8 ft 6 in ( 2.59 m ) in the beam . She displaced 5 tons drawing 2 ft 9 in ( 0.84 m ) of water . Power was provided by a 1 shaft Thornycroft V - 12 petrol engine which developed 275 bhp ( 205 kW ) and achieved a top speed of 24.8 knots ( 45.9 km / h ) . The boat was armed with one 18 - inch ( 460 mm ) torpedo and four .303 Lewis machine guns . It carried a crew of 3 . In May 1916 , Lieutenant W. N. T. Beckett MVO DSC took command of the newly built HM Coastal Motor Boat 4 . In December 1916 he proceeded to Dunkirk in charge of the 3rd CMB Division and operated on the Belgian coast . Beckett was in command of a Divisional CMB attack on German destroyers at Zeebrugge on 7 April 1917 ; as a result one was sunk and one very seriously damaged . For these actions Beckett was mentioned in Despatches and was awarded the Distinguished Service Cross ( DSC ) . The boat , under the command of Lieutenant Augustus Agar , V.C. , was made famous by his part in the British operations in the Baltic Sea against the Bolsheviks in 1919 where she operated with her sister ships in activities such as the raid on Kronstadt . After the action the boat was returned to the United Kingdom where it was on display first at the Imperial War Museum in London and then at the Vosper works on Platt 's Eyot ( island ) on the River Thames near Kingston for many years with a Victoria Cross painted on the side until the Vosper works there closed . It was then restored and is now on display with details of the action but with the painted VC removed at the Imperial War Museum 's out - station in Duxford near Cambridge . Agar 's VC is held by the War Museum in London . The boat was inscribed on the National Register of Historic Vessels in May 1996 , becoming part of the National Historic Fleet ., The Irish Sea (, , , Ulster-Scots: "Airish Sea"), separates the islands of Ireland and Great Britain. It is connected to the Celtic Sea in the south by St George's Channel, and to the Inner Seas off the West Coast of Scotland in the north by the North Channel. Anglesey is the largest island within the Irish Sea, followed by the Isle of Man. The sea is occasionally, but rarely, referred to as the Manx Sea., The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a sovereign country in western Europe. Lying off the north-western coast of the European mainland, it includes the island of Great Britain (the name of which is also loosely applied to the whole country), the north-eastern part of the island of Ireland, and many smaller islands. Northern Ireland is the only part of the UK that shares a land border with another sovereign statethe Republic of Ireland. Apart from this land border, the UK is surrounded by the Atlantic Ocean, with the North Sea to its east, the English Channel to its south and the Celtic Sea to its south-south-west, giving it the 12th-longest coastline in the world. The Irish Sea lies between Great Britain and Ireland. With an area of , the UK is the 78th-largest sovereign state in the world and the 11th-largest in Europe. It is also the 21st-most populous country, with an estimated 65.1 million inhabitants. Together, this makes it the fourth most densely populated country in the European Union., The North Sea is a marginal sea of the Atlantic Ocean located between Great Britain, Scandinavia, Germany, the Netherlands, Belgium, and France. An epeiric (or "shelf") sea on the European continental shelf, it connects to the ocean through the English Channel in the south and the Norwegian Sea in the north. It is more than long and wide, with an area of around ., Subject: hm coastal motor boat 4, Relation: operator, Options: (A) germany (B) ireland (C) royal navy (D) southern (E) united kingdom
Output: royal navy