Convoy

Age of Sail Naval convoys have been in use for centuries, with examples of merchant ships traveling under naval protection dating to the 12th century. The use of organized naval convoys dates from when ships began to be separated into specialist classes and national navies were established. By the French Revolutionary Wars of the late 18th century, effective naval convoy tactics had been developed to ward off pirates and privateers. Some convoys contained several hundred merchant ships. The most enduring system of convoys were the Spanish treasure fleets, 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 as hard to find as a single ship. Even if the privateer found a convoy and the wind was favourable for an attack, it could still hope to capture only a handful of ships before the rest managed to escape, and a small escort of warships could easily thwart it. As a result of the convoy system's effectiveness, wartime insurance premiums were consistently lower for ships that sailed in convoys. Convoy duty also exposes the escorting warships to the sometimes hazardous conditions of the North Atlantic, with only rare occurrences of visible achievement (i.e. fending off a submarine assault). World War II Atlantic , Nova Scotia on 1 April 1943 The British adopted a convoy system, initially voluntary and later compulsory for almost all merchant ships, the moment that World War II was declared. Each convoy consisted of between 30 and 70 mostly unarmed merchant ships. Canadian, and later American, supplies were vital for Britain to continue its war effort. The course of the 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 capability of a heavily armed warship against a convoy was dramatically illustrated by the fate of Convoy HX 84. On November 5, 1940, the German heavy cruiser encountered the convoy. Maiden, Trewellard, and Kenbame Head were quickly sunk, with Beaverford and Fresno City suffering the same fate later. Only the sacrifices of the armed merchant cruiser and the freighter Beaverford to stall the Scheer, in addition to failing light, allowed the rest of the convoy to escape. The deterrence value of a battleship in protecting a convoy was also dramatically illustrated when the German light battleships (referred by some as battlecruisers) and , mounting guns, came upon an eastbound British convoy (HX 106, with 41 ships) in the North Atlantic on February 8, 1941. When the Germans detected the slow but well-protected battleship escorting the convoy, they fled the scene rather than risk damage from her 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. Prior to overt participation in World War II, the US was actively engaged in convoys with the British in the North Atlantic Ocean, primarily supporting British activities in Iceland. After Germany declared war on the US, the US Navy decided not to organize convoys on the American eastern seaboard. US 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. Convoy battles at anchor in the harbor at Hvalfjord, Iceland, 1942 Many naval battles of World War II were fought around convoys, including: • Convoy PQ 16, May 1942 • Convoy PQ 17, June–July 1942 • Convoy PQ 18, September 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, Type VII and Type IX U-boats 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 traveled 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-World War II vessels escorting the tanker Gas King in 1987 The largest convoy effort since World War II was Operation Earnest Will, the U.S. Navy's 1987–88 escort of reflagged Kuwaiti tankers in the Persian Gulf during the Iran–Iraq War. In the present day, convoys are used as a tactic by navies to deter pirates off the coast of Somalia from capturing unarmed civilian freighters who would otherwise pose easy targets if they sailed alone. ==Road convoys==

Military convoys Military convoys function as tactical units organized for the secure transport of personnel and supplies through hazardous areas. In asymmetric warfare, these formations frequently integrate engineering assets, such as bulldozers, to clear man-made obstacles—including debris or felled trees—designed to stall movement. A typical operational convoy maintains a heterogeneous structure, combining light reconnaissance vehicles for scouting with heavy logistics trucks for sustained mobility. Historical field operations demonstrate that these groups also serve as mobile command posts where tactical coordination and navigation are managed directly from vehicle platforms to maintain situational awareness in rugged terrain.s traveling between Iraq and Kuwait during the Iraq War in 2010 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—a stated objective in some cases—"solidarity". In the 1990s these convoys became common traveling from Western Europe to countries of the former Yugoslavia, in particular 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. Beyond volunteer efforts, professional humanitarian convoys are governed by strict operational protocols to ensure safe delivery in high-risk zones. Unlike military formations, these convoys prioritize "neutrality and visibility," often relying on flags and organizational logos as a primary means of protection while avoiding armed escorts to maintain their civilian status. Key logistical principles include the designation of a "convoy leader" to manage movement and the rule of collective stopping, ensuring no vehicle is abandoned during mechanical failure in hazardous areas. In cross-border operations, these convoys undergo rigorous inspections and "anti-smuggling" verifications to guarantee that cargo remains untampered with and dedicated solely to humanitarian relief. This professionalized approach allows aid organizations to navigate environments with fragmented communications and poor infrastructure where standard commercial freight is unfeasible. During the Cold War with its high number of military exercises, the military was the main user of convoy rights. Today, catastrophes like large-scale flooding might bring a high number of flagged convoys to the roads. Large-scale evacuations for the disarming of World War II bombs are another common reason for non-governmental organization (NGO) unit movements under convoy rights. Storm convoys In Norway, "convoy driving" () is used during winter in case weather is too bad for vehicles to pass on their own. Convoy driving is initiated when the strong wind quickly fills the road with snow behind snowplows, particularly on mountain passes. Only a limited number of vehicles are allowed for each convoy and convoy leader is obliged to decline vehicles not fit for the drive. Storm convoys are prone to multiple-vehicle collision. Convoy driving is used through Hardangervidda pass on road 7 during blizzards. Convoy is sometimes used on road E134 at the highest and most exposed sections during bad weather. On European route E6 through Saltfjellet pass convoy driving is often used when wind speed is over 15–20 m/s (fresh or strong gale) in winter conditions. During the winter of 1990 there was convoy driving for almost 500 hours at Saltfjellet ==See also==