Convoy 42990 225502372 2008-07-14T01:04:20Z 24.69.0.74 /* Truckers convoys */ {{otheruses}} [[Image:BaghdadWindshield.jpg|thumb|right|308px|A view through the windshield of a U.S. Army [[HMMWV]] traveling in a convoy in [[Baghdad]], Iraq (April 2005).]] A '''convoy''' is a group of [[vehicle]]s (of any type, but usually motor vehicles or ships) traveling together for mutual support. Often, a convoy is organized with armed defensive support, though it may also be used in a non-military sense, for example when driving through remote areas. If one vehicle breaks down or gets stuck, the other vehicles can assist with repairs or attempt to free the bogged-down vehicle. If repairs are not possible, the people from the broken-down vehicle can transfer to others. ==Naval convoys== ===Age of Sail=== By the [[French Revolutionary Wars]] of the late 18th century, effective [[naval warfare|naval]] convoy [[naval tactics|tactics]] had been developed to ward off [[pirate]]s and [[privateer]]s. Some convoys contained several hundred merchant ships. The most enduring system of convoys were the [[Spanish treasure fleet]]s, that sailed from the 1520s until 1790. When merchant ships sailed independently, a privateer could cruise a shipping lane and capture ships as they passed. Ships sailing in convoy presented a much smaller target: a convoy was no more likely to be found than a single ship. Even if the privateer found a convoy and the wind was favourable for an attack, it could hope to capture only a handful of ships before the rest managed to escape, and a small escort of warships could easily thwart it. Many [[naval battles]] in the [[age of sail]] were fought around convoys, including: *The [[Battle of Portland]] (1653) *The [[Battle of Ushant]] (1781) *The [[Battle of Dogger Bank (1781)|Battle of Dogger Bank]] (1781) *[[The Glorious First of June]] (1794) ===World War I=== In the early 20th century, the [[HMS Dreadnought (1906)|dreadnought]] changed the balance of power in convoy battles. Steaming faster than merchant ships and firing at long ranges, a single [[battleship]] could destroy many ships in a convoy before the others could scatter over the horizon. To protect a convoy against a capital ship required providing it with an escort of another capital ship; a very high cost. Battleships were the main reason that the British [[Admiralty]] did not adopt convoy tactics at the start of the [[first Battle of the Atlantic]] in [[World War I]]. But by the end of 1914, German capital ships had largely been cleared from the oceans and the main threat to shipping came from [[U-boat]]s. From a tactical point of view, World War I-era [[submarine]]s were similar to privateers in the age of sail: only a little faster than the merchant ships they were attacking, and capable of sinking only a small number of vessels in a convoy because of their limited supply of torpedoes and shells. The Admiralty took a long time to respond to this change in the tactical position, and only in 1917, at the urging of the [[British Prime Minister]], [[David Lloyd George]], did they institute a convoy system. Losses to U-boats dropped to a small fraction of their former level. Other arguments against convoy were raised. The primary issue was the loss of productivity, as merchant shipping in convoy has to travel at the speed of the slowest vessel in the convoy and spent a considerable amount of time in ports waiting for the next convoy to depart. Further, large convoys were thought to overload port resources. Actual analysis of shipping losses in World War I disproved all these arguments, at least so far as they applied to transatlantic and other long-distance traffic. Ships sailing in convoys were far less likely to be sunk, even when not provided with any escort at all. The loss of productivity due to convoy delays was small compared with the loss of productivity due to ships being sunk. Ports could deal more easily with convoys because they tended to arrive on schedule and so loading and unloading could be planned. In his book ''[[Military incompetence|On the Psychology of Military Incompetence]]'', Norman Dixon suggested that the hostility towards convoys in the naval establishment were in part caused by a (sub-conscious) perception of convoys as effeminating, due to warships having to care for civilian merchant ships.<ref>Dixon, Dr. Norman F. ''On the Psychology of Military Incompetence'' Jonathan Cape Ltd 1976 / Pimlico 1994 pp210–211</ref> Also, it should be noted that convoy duty exposes the escorting warships to the uncomfortable and sometimes outright hazardous conditions of the North Atlantic, but with only extremely rare occurrences of visible achievement (i.e. fending off a submarine assault). ===World War II=== The British adopted a convoy system, initially voluntary and later compulsory for almost all merchant ships, the moment that [[World War II]] was declared. Canadian, and later American, supplies were vital for Britain to continue its war effort. The course of the [[second Battle of the Atlantic]] was a long struggle as the Germans developed anti-convoy tactics and the British developed counter-tactics to thwart the Germans. The power of a battleship against a convoy was dramatically illustrated by the fate of [[Convoy HX-84]]. On [[November 5]], [[1940]], the German pocket battleship [[German pocket battleship Admiral Scheer|''Admiral Scheer'']] encountered the convoy. ''Maiden'', ''Trewellard'', ''Kenbame Head'', ''Beaverford'', and ''Fresno'' were quickly sunk, and other ships were damaged. Only the sacrifice of the [[Armed Merchant Cruiser]] [[HMS Jervis Bay (F40)|HMS ''Jervis Bay'']] and failing light allowed the rest of the convoy to escape. The power of a battleship in protecting a convoy was also dramatically illustrated when the German warships [[German warship Scharnhorst (1936)|''Scharnhorst'']] and [[German warship Gneisenau (1936)|''Gneisenau'']] came upon an eastbound British convoy of 41 ships, [[HX-106]] in the North Atlantic on February 8th, 1941. When they noticed the presence in the escort of the old battleship, [[HMS Ramillies (07)|HMS ''Ramillies'']], they fled the scene, rather than risk damage from her 15" guns. The enormous number of vessels involved and the frequency of engagements meant that statistical techniques could be applied to evaluate tactics: an early use of [[operational research]] in war. On the entry of the U.S. into World War II, the U.S. Navy decided not to instigate convoys on eastern seaboard of the U.S. Fleet Admiral [[Ernest King]] ignored advice on this subject from the British as he had formed a poor opinion of the Royal Navy early in his career. The result was what the U-boat crews called their [[second happy time]], which did not end until convoys were introduced. This was, unfortunately for the Allies, as near to a laboratory test as is ever seen in war time and it proved conclusively that convoys worked. The German anti-convoy [[Naval tactics in the Age of Steam|tactics]] included: *long-range surveillance aircraft to find convoys; *strings of U-boats ([[wolf pack]]s) that could be directed onto a convoy by radio; *breaking the British naval codes; *improved anti-ship weapons, including magnetic detonators and sonic homing torpedoes. The Allied responses included: *[[air raid]]s on the U-boat bases at [[Brest, France|Brest]] and [[La Rochelle]]; *converted merchant ships, eg, [[Merchant aircraft carrier]]s, [[CAM ship|Catapult Aircraft Merchantman]] and [[Armed merchantmen#Armed merchant cruisers|armed merchant cruisers]] *more convoy escorts, including cheaply produced [[corvette]]s, [[frigate]]s, and [[escort aircraft carrier|escort carrier]]s; *improved anti-submarine weapons such as the [[hedgehog (weapon)|hedgehog]]; *long-range aircraft patrols to find U-boats; *larger convoys, allowing more escorts per convoy as well as the extraction of enough escorts to form support groups that operated in defence of convoys that faced an above-average risk of attack *allocating vessels to convoys according to speed, so that faster ships were less exposed. They were also aided by *improved [[sonar]] ([[Sonar|ASDIC]]) allowing escort vessels to better track U-boats; *breaking the [[Enigma machine|German naval cipher]]; *improved [[radar]] and [[radio direction finding]] allowing planes to find and destroy U-boats; During World War II, [[Japan]]ese vessels rarely traveled in convoys (see also [[USS Grayback (SS-208)|USS ''Grayback'']] and [[USS Thresher (SS-200)|USS ''Thresher'']]). Their merchant fleet was largely destroyed by Allied submarines. Many naval battles of World War II were fought around convoys, including: * [[Convoy PQ-16]], May 1942 * [[Convoy PQ-17]], June-July 1942 * [[Operation Pedestal]], August 1942 * The [[Naval Battle of Guadalcanal]], November 1942 * The [[Battle of the Barents Sea]], December 1942 * The [[Battle of the Bismarck Sea]], March 1943 The convoy prefix indicates the route of the convoy. For example, 'PQ' would be Iceland to Northern Russia and 'QP' the return route. ===Analysis=== The success of convoys as an anti-submarine tactic during the world wars can be ascribed to several reasons related to u-boat capabilities, the size of the ocean and convoy escorts. In practice, [[German Type VII submarine|Type VII]] and [[German Type IX submarine|Type IX u-boat]]s were limited in their capabilities. Submerged speed and endurance was limited and not suited for overhauling many ships. Even a surfaced u-boat could take several hours to gain an attack position. Torpedo capacity was also restricted to around fourteen (Type VII) or 24 (Type IX), thus limiting the number of attacks that could be made, particularly when multiple firings were necessary for a single target. There was a real problem for the u-boats and their adversaries in finding each other; with a tiny proportion of the ocean in sight, without intelligence or radar, warships and even aircraft would be fortunate in coming across a submarine. The Royal Navy and later the United States Navy each took time to learn this lesson. Conversely, a u-boat's radius of vision was even smaller and had to be supplemented by regular long-range reconnaissance flights. For both major allied navies, it had been difficult to grasp that, however large a convoy, its " footprint" (the area within which it could be spotted) was far smaller than if the individual ships had travelled independently. In other words, a submarine had less chance of finding a single convoy than if it were scattered as single ships. Moreover, once an attack had been made, the submarine would need to regain an attack position on the convoy. If, however, an attack were thwarted by escorts, even if the submarine had escaped damage, it would have to remain submerged for its own safety and might only recover its position after many hours' hard work. U-boats patrolling areas with constant and predictable flows of sea traffic, such as the United States Atlantic coast in early 1942, could dismiss a missed opportunity in the certain knowledge that another would soon present itself. The destruction of submarines required their discovery, an improbable occurrence on aggressive patrols, by chance alone. Convoys, however, presented irresistible targets and could not be ignored. For this reason, the u-boats presented themselves as targets to the escorts with increasing possibility of destruction. In this way, the Ubootwaffe suffered severe losses, for little gain, when pressing pack attacks on well-defended convoys. ===Post-WWII=== The largest convoy effort since World War II was [[Operation Earnest Will]], the [[United States Navy|U.S. Navy's]] 1987&ndash;88 escort of reflagged [[Kuwait]]i [[Tanker (ship)|tanker]]s in the [[Persian Gulf]] during the [[Iran-Iraq War]]. It seems that [[satellite]] surveillance, [[aircraft carrier]]s, [[cruise missile]]s and modern submarines have turned the tactical advantage decidedly in favour of the attacker. See the [[modern naval tactics]] article for an idea of the problems facing the defender. ==Humanitarian aid convoys== The word, "convoy" is also associated with groups of road vehicles being driven, mostly by volunteers, to deliver [[humanitarian aid]], supplies, and &ndash; a stated objective in some cases &ndash; "solidarity". <ref>[http://www.aidconvoy.net/links.htm Aid Convoy (charitable organisation) information on partners]</ref> In the 1990s these convoys became common travelling from [[Western Europe]] to countries of the former [[Yugoslavia]], in particular [[Bosnia and Herzegovina|Bosnia]] and [[Kosovo]], to deal with the aftermath of the wars there. They also travel to countries where standards of care in institutions such as orphanages are considered low by Western European standards, such as [[Romania]]; and where other disasters have led to problems, such as around the [[Chernobyl disaster]] in [[Belarus]] and [[Ukraine]]. The convoys are made possible partly by the relatively small geographic distances between the stable and affluent countries of Western Europe, and the areas of need in [[Eastern Europe]] and, in a few cases, [[North Africa]] and even [[Iraq]]. They are often justified because although less directly cost-effective than mass freight transport, they emphasise the support of large numbers of small groups, and are quite distinct from multinational organisations such as [[United Nations]] humanitarian efforts. ==Truckers convoys== The film, ''[[Convoy (film)|Convoy]]'' immortalises comradeship between truck drivers, where the culture of the [[CB radio]] encourages truck drivers to travel in convoys. Trucker convoys were created as a byproduct of the 55mph speed limit and 18-wheelers becoming the prime targets of speed traps. Most truckers had difficult schedules to keep and as a result had to maintain a speed above the posted speed limit in order to reach their destinations on time. Convoys were started so that multiple trucks could run together at a high speed with the thinking being that if they passed a speed trap the police would only be able to pull over one of the trucks in the convoy. ==See also== * [[Camel train]] ====Military convoys==== *[[List of convoy codes]] and the similar [[List of World War II convoys]] *[[Arctic convoys of World War II]] *[[convoy commodore]] *[[Malta Convoys]] *The 1940 massacre of [[convoy SC-7]] *[[Q-ship]] *[[Anti-submarine warfare]] ====Humanitarian convoys==== *[[Aid Convoy]] *[[Workers' Aid for Bosnia]] ==References== {{reflist}} *Convoy, The Defense of Sea Trade 1890-1990, John Winton 1983. ISBN 0 7181 21635 ==External links== * [http://users.accesscomm.ca/shipwreck/index4.htm Lists of convoy prefixes for both World Wars] * [http://www.convoyweb.org.uk/index.html Convoy web] &ndash; a comprehensive analysis of certain naval convoy routes * [http://www.aidconvoy.net/ Aid Convoy] &ndash; a humanitarian aid charity running convoys [[Category:Naval warfare]] [[Category:Transportation]] [[cs:Konvoj]] [[da:Konvoj]] [[es:Convoy]] [[eo:Karavano]] [[he:שיירה]] [[ms:Konvoi]] [[nl:Konvooi]] [[ja:護送船団]] [[no:Konvoi]] [[pl:Konwój]] [[sk:Konvoj (organizovaná skupina vozidiel)]] [[fi:Kuljetussaattue]] [[sv:Konvoj]] [[tl:Komboy]]