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Submarine warfare consists primarily of diesel and nuclear submarines using torpedoes, missiles or nuclear weapons, as well as advanced sensing equipment, to attack other submarines, ships, or land targets. Submarines may also be used for reconnaissance and landing of special forces as well as deterrence. In some navies they may be used for task force screening. The effectiveness of submarine warfare partly depends on the anti-submarine warfare carried out in response.
American Civil War
The age of submarine warfare began during the American Civil War. The 1860s was a time of many turning points in terms of how naval warfare was fought. Many new types of warships were being developed for use in the United States and Confederate States Navies. Submarine watercraft were among the newly created vessels. The first sinking of an enemy ship by a submarine occurred on 17 February 1864, when the Confederate submarine H.L. Hunley, a privateer sank the sloop USS Housatonic in Charleston Harbor, South Carolina. Shortly afterward, however, the Hunley sank, with the loss of her entire crew of eight. The crew was found later, on February 22.
World War I
Submarine warfare in World War I was primarily a fight between German U-boats and Atlantic supply convoys bound for Great Britain, France, and Russia. British and Allied submarines conducted widespread operations in the Baltic, North Sea, Atlantic, Mediterranean and Black Seas. Only a few actions occurred outside the wider European-Atlantic theatre. German submarine attacks on Allied merchant ships, especially the sinking of the Lusitania, turned American public opinion against the Central Powers and played a large role in the United States entering the war in April 1917.
All participants were supposed to abide by the Hague Conventions of 1899 and 1907, but this was found to be impracticable for submarines. Initially, German submarines did attempt to comply with the prize rules, but later switched to unrestricted submarine warfare. American diplomatic pressure forced the Germans to stop this for a while, but in January 1917 Germany declared a war zone around the British Isles and sank up to a quarter of shipping entering it, until escorted convoys were introduced.  The sinking of the Pathfinder was the first combat victory of a modern submarine, and the exploits of U-9, which sank three British cruisers in under an hour, establishing the submarine as an important new component of naval warfare.
German submarines were used to lay mines and to attack iron ore shipping in the Baltic. The British submarine flotilla in the Baltic operated in support of the Russians until the Russian-German Pact. During the war, the British invested efforts into developing a submarine that could operate in conjunction with a battleship fleet - the "Fleet Submarine". To achieve the necessary 20 knots (surfaced) the K class submarines were steam powered. In practice, the K class were a constant problem and could not operate effectively with a fleet.
Between the wars, navies experimented with submarine cruisers (France, Surcouf), submarines armed with battleship calibre guns (UK, HMS M1) and submarines capable of carrying small aircraft for reconnaissance (HMS M2 and the Surcouf).
Germany was denied submarines by the terms of the Treaty of Versailles, but built some anyway. This was not legitimized until the Anglo-German Naval Agreement of 1935, under which the UK accepted German parity in submarine numbers with the Royal Navy.
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World War II
In World War II, submarine warfare was split into two main areas - the Atlantic and the Pacific. The Mediterranean Sea was also a very active area for submarine operations. This was particularly true for the British and French, as well as the Germans. The Italians were also involved, but achieved their greatest successes using midget submarines and human torpedoes.
In the Atlantic, where German submarines again sought out and attacked Allied convoys, this part of the war was very reminiscent of the latter part of World War I. Many British submarines were active as well, particularly in the Mediterranean and off Norway, against Axis warships, submarines and merchant shipping.
Initially, Hitler ordered his submarines to abide by the prize rules, but this restriction was withdrawn in December 1939. Although mass attacks by submarine had been carried out in World War I, the "wolf pack" was mainly a tactic of World War II U-boats. The main steps in this tactic were as follows:
- A number of U-boats were dispersed across possible paths of a convoy.
- A boat sighting a convoy would signal its course, speed and composition to German Naval Command.
- The submarine would continue to shadow the convoy, reporting any changes of course.
- The rest of the pack would then head to the first boat's position.
- When the pack was formed, a coordinated attack would be made on the surface at night.
- At dawn, the pack would withdraw, leaving a shadower, and resume the attack at dusk.
With the later increase in warship and aircraft escorts, U-boat losses became unacceptable. Many boats were lost, and the earlier "aces" with them.
In the Pacific, the situation was reversed, with US submarines hunting Japanese shipping. By war's end, U.S. submarines had destroyed over half of all Japanese merchant ships, totaling well over five million tons of shipping. British and Dutch submarines also took part in attacks on Japanese shipping, mostly in coastal waters. Japanese submarines were initially successful, destroying two U.S. fleet aircraft carriers, a cruiser, and several other ships. However, following a doctrine that concentrated on attacking warships, rather than more-vulnerable merchantmen, the smaller Japanese fleet proved ineffectual in the long term, while suffering heavy losses to Allied anti-submarine measures. Italian submarines and one German submarine operated in the Pacific Ocean, but never enough to be an important factor, inhibited by distance and difficult relations with their Japanese ally.
Japanese submarines operated in the Indian Ocean, forcing the British surface fleet to withdraw to the east coast of Africa. Some German and Italian submarines operated in the Indian Ocean, but never enough to play a significant role. See Monsun Gruppe.
Post-World War II
The advent of the nuclear-powered submarine in the 1950s brought about a major change in submarine warfare. These boats could operate faster, deeper and had much longer endurance. They could be larger and so became missile launching platforms. In response to this the attack submarine became more important, particularly in regard to its role as a hunter-killer. The US also used nuclear submarines as radar pickets for a while. Diesel-electric submarines have continued to be used as they are better in coastal waters and less expensive, while also much quieter than earlier nuclear subs [the tradeoff is that a nuclear reactor has a minimal amount of circulation noise whereas a diesel-electric can operate completely off batteries for a limited time and hence be functionally completely silent]. There have also been major advances in sensors and weapons.
During the Cold War, the United States and the Soviet Union played what was described as a 'cat-and-mouse' game of detecting and even trailing enemy submarines. As the West enjoyed a considerable advantage in the quality of its technology, by the early 80s U.S. attack submarines were almost as quiet as an equivalent body of seawater, a benchmark the Russian Navy did not reach until after the collapse of the Soviet Union. Indeed, the technological difference between the rival powers were so huge, that Soviet subs in the early days could be heard 'across the Atlantic' (in one hyperbole), and Soviet subs were forced to periodically 'clear the baffles' through high-speed, 'jinking' manuveurs that themselves generated noise, known informally as "Crazy Ivans."
Since the Second World War, several wars, such as the Korean War, Indo-Pakistani War of 1971 and the Falklands War, have involved the use of submarines. However, the importance of the submarine has shifted to an even more strategic role than the disruption of merchant shipping, with the advent of the nuclear ballistic missile submarine carrying Submarine-launched ballistic missiles with nuclear weapons to provide second strike capability or even for example for the mere existence of a submarine curtailing surface warships' freedom to operate. To counter the threat of these submarines, hunter submarines were developed in turn. Later submarine-launched land-attack missiles were employed against Iraq and Afghanistan. The role of the submarine has extended with the use of submarine-launched autonomous unmanned vehicles. The development of new air independent propulsion methods has meant that the diesel-electric submarine's need to surface, making it vulnerable, has been reduced. Nuclear submarines, although far larger, could generate their own air and water for quite extended durations, meaning their need to surface was limited in any case.
In today's more fractured geopolitical system, many nations are building and/or upgrading their submarines. The JMSDF has launched new models of submarines every few years; South Korea has upgraded the already capable Type 209 design from Germany and sold copies to Indonesia. Russia has improved the old Soviet Kilo model into what strategic analysts are calling equivalent to the 1980s-era 688-class, and so on.
At the end of his naval warfare book The Price of Admiralty, military historian John Keegan postulates that eventually, almost all roles of surface warships will be taken over by submarines, as they will be the only naval units capable of evading the increasing intelligence capabilities (space satellites, airplanes etc.) that a fight between evenly matched modern states could bring to bear on them.
Modern submarine missions
A modern submarine is a multi-role platform. It can conduct both overt and covert operations. In peacetime it can act as a deterrent as well as for surveillance operations and information gathering.
In wartime a submarine can carry out a number of missions including:
- Surveillance and information gathering
- Communication of data
- Landing of special operations forces
- Attack of land targets (first cruise missile fired from sub, Gulf War, USS Louisville, Jan 1991)
- Protection of task forces and merchant shipping
- Denial of sea areas to an enemy
The United States Navy says, "Submarines require no vulnerable underway logistics chain nor depend on mutual defense from other platforms for survivability."
References and sources
- Tucker, Spencer; Roberts, Priscilla Mary (9 January 2014) , Daniel Ramos, ed., World War I: Encyclopedia (Digitized by Google Books online), United States: ABC-CLIO, p. 312, ISBN 9781851094202
- Story of the U-21, National Underwater and Marine Agency, retrieved 2008-11-02
- Helgason, Guðmundur (2008), U 9, Uboat.net, retrieved 2008-11-02
- Blair, Clay, Jr. Silent Victory (New York, 1976), p.878.
- Klemen, L (1999–2000). "The U-Boat War in the Indian Ocean". Forgotten Campaign: The Dutch East Indies Campaign 1941-1942.
- BGM-109 Tomahawk - Smart Weapons
- USS Albuquerque Joins San Diego-based Fleet, Contributes to Maritime Strategy
- John Abbatiello. Anti-Submarine Warfare in World War I: British Naval Aviation and the Defeat of the U-Boats (2005)
- Blair, Clay. Silent Victory: The U. S. Submarine War Against Japan 2 vol (1975)
- Gray, Edwyn A. The U-Boat War, 1914-1918 (1994)
- Preston, Anthony. The World's Greatest Submarines (2005).
- Roscoe, Theodore. United States Submarine Operations in World War II (US Naval Institute, 1949).
- van der Vat, Dan. The Atlantic Campaign Harper & Row, 1988. Connects submarine and antisubmarine operations between World War I and World War II, and suggests a continuous war.
- Hackmann, Willem. Seek & Strike: Sonar, anti-submarine warfare and the Royal Navy 1914-54. London: Her Majesty's Stationery Office, 1984. ISBN 0-11-290423-8
- Historic films showing submarine warfare during World War I at europeanfilmgateway.eu