Military logistics is the discipline of planning and carrying out the movement, supply, and maintenance of military forces. In its most comprehensive sense, it is those aspects or military operations that deal with:
- Design, development, acquisition, storage, distribution, maintenance, evacuation, and disposition of materiel.
- Transport of personnel.
- Acquisition or construction, maintenance, operation, and disposition of facilities.
- Acquisition or furnishing of services.
- Medical and health service support.
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The word "logistics" is derived from the Greek adjective logistikos meaning "skilled in calculating". The first administrative use of the word was in Roman and Byzantine times when there was a military administrative official with the title Logista. At that time, the word apparently implied a skill involved in numerical computations.
Historically supplies for an army were first acquired by foraging or looting, especially in the case of food and fodder, although if traveling through a desolated region or staying in one place for too long resources could quickly be exhausted. A second method was for the army to bring along what was needed, whether by ships, pack animals, wagons or carried on the backs of the soldiers themselves. This allowed the army some measure of self-sufficiency, and up through to the 19th century most of the ammunition a soldier needed for an entire campaign could be carried on their person. However, this method led to an extensive baggage train which could slow down the army's advance and the development of faster-firing weapons soon outpaced an army's ability to supply itself. Starting with the Industrial Revolution new technological, technical and administrative advances led to a third method, that of maintaining supplies in a rear area and transporting them to the front. This led to a "logistical revolution" which began in the 20th century and drastically improved the capabilities of modern armies while making them highly dependent on this new system.
5th to 15th century
Through the medieval period (the 5th to 15th century in Europe), soldiers were responsible for supplying themselves, either through foraging, looting, or purchases. Even so, military commanders often provided their troops with food and supplies, but this would be provided in lieu of the soldiers' wages, or soldiers would be expected to pay for it from their wages, either at cost or even with a profit.
In 1294, the same year John II de Balliol of Scotland refused to support Edward I of England's planned invasion of France, Edward I implemented a system in Wales and Scotland where sheriffs would acquire foodstuffs, horses and carts from merchants with compulsory sales at prices fixed below typical market prices under the Crown's rights of prise and purveyance. These goods would then be transported to Royal Magazines in southern Scotland and along the Scottish border where English conscripts under his command could purchase them. This continued during the First War of Scottish Independence which began in 1296, though the system was unpopular and was ended with Edward I's death in 1307.
Starting under the rule of Edward II in 1307 and ending under the rule of Edward III in 1337, the English instead used a system where merchants would be asked to meet armies with supplies for the conscripts to purchase. This led to discontent as the merchants saw an opportunity to profiteer, forcing conscripts to pay well above normal market prices for food.
As Edward III went to war with France in the Hundred Years' War (starting in 1337), the English returned to a practice of foraging and looting to meet their logistical needs. This practice lasted throughout the course of war, extending through the remainder of Edward III's reign into the reign of Henry VI.
Starting in the late sixteenth century armies in Europe greatly increased in size, upwards of 100,000 or more in some cases. This increase in size came not just in the number of actual soldiers but also camp followers—anywhere from half to one and a half the size of the army itself—and the size of the baggage train—averaging one wagon for every fifteen men. However, very little state support was provided to these massive armies, the vast majority of which consisted of mercenaries. Beyond being paid for their service by the state—an act which bankrupted even the Spanish Empire on several occasions—these soldiers and their commanders were forced to provide everything for themselves. If permanently assigned to a town or city with a working marketplace, or traveling along a well-established military route, supplies could be easily bought locally with intendants overseeing the exchanges. In other cases an army traveling in friendly territory could expect to be followed by sutlers—although their supply stocks were small and subject to price gouging—or a commissioner could be sent ahead to a town to make arraignments, including quartering if necessary.
When operating in enemy territory an army was forced to plunder the local countryside for supplies, a historical tradition meant to allow war to be conducted at the enemy's expense. However, with the increase in army sizes this reliance on plunder became a major problem, as many decisions regarding where an army could move or fight were made based not on strategic objectives but whether a given area was capable of supporting the soldiers' needs. Sieges in particular were affected by this, both for any army attempting to lay siege to a location or coming to its relief. Unless a military commander was able to implement some sort of regular resupply, a fortress or town with a devastated countryside could be effectively immune to either operation.
Conversely, armies of this time had little need to maintain lines of communication while on the move, except insofar as it was necessary to recruit more soldiers, and thus could not be cut off from non-existent supply bases. Although this theoretically granted armies freedom of movement, the need for plunder prevented any sort of sustained, purposeful advance. Many armies were further restricted to following waterways due to the fact that what supplies they were forced to carry could be more easily transported by boat. Artillery in particular was reliant of this method of travel, since even a modest number of cannons of the period required hundreds of horses to pull overland and traveled at half the speed of the rest of the army.
By the seventeenth century, the French under Secretary of State for War Michel Le Tellier began a series of military reforms to address some of the issues which had plagued armies in the previous century. Besides ensuring that soldiers were more regularly paid and combating the corruption and inefficiencies of private contractors, Le Tellier devised formulas to calculate the exact amount of supplies necessary for a given campaign, created standardized contracts for dealing with commercial suppliers, and formed a permanent vehicle-park manned by army specialists whose job was to carry a few days' worth of supplies while accompanying the army during campaigns. With these arrangements there was a gradual increase in the use of magazines which could provide a more regular flow of supply via convoys. While the concepts of magazines and convoys was not new at this time, prior to the increase in army sizes there had rarely been cause to implement them.
Despite these changes, French armies still relied on plunder for a majority of their needs while on the move. Magazines were created for specific campaigns and any surplus was immediately sold for both monetary gain and to lessen the tax burden. The vehicles used to form convoys were contracted out from commercial interests or requisitioned from local stockpiles. In addition, given warfare of this era's focus on fortified towns and an inability to establish front lines or exert a stabilizing control over large areas, these convoys often needed armies of their own to provide escort. The primary benefits of these reforms was to supply an army during a siege. This was borne out in the successful campaign of 1658 when the French army at no point was forced to end a siege on account of supplies, including the Siege of Dunkirk.
Le Tellier's son Louvois would continue his father's reforms after assuming his position. The most important of these was to guarantee free daily rations for the soldiers, amounting to two pounds of bread or hardtack a day. These rations were supplemented as circumstances allowed by a source of protein such as meat or beans; soldiers were still responsible for purchasing these items out-of-pocket but they were often available at below-market prices or even free at the expense of the state. He also made permanent a system of magazines which were overseen by local governors to ensure they were fully stocked. Some of these magazines were dedicated to providing frontier towns and fortresses several months' worth of supplies in the event of a siege, while the rest were dedicated to supporting French armies operating in the field.
With these reforms French armies enjoyed one of the best logistical systems in Europe, however there were still severe restrictions on its capabilities. Only a fraction of an army's supply needs could be met by the magazines, requiring that it continue to use plunder. In particular this was true for perishable goods or those too bulky to store and transport such as fodder. The administration and transportation of supplies remained inadequate and subject to the deprivations of private contractors. The primary aim of this system was still to keep an army supplied while conducting a siege, a task for which it succeeded, rather than increase its freedom of movement.
The British were seriously handicapped in the American Revolutionary War by the need to ship all supplies across the Atlantic, since the Americans prevented most local purchases. The British found a solution after the war by creating the infrastructure and the experience needed to manage an empire. London reorganized the management of the supply of military food and transport that was completed in 1793–94 when the naval Victualling and Transport Boards undertook those responsibilities. It built upon experience learned from the supply of the very-long-distance Falklands garrison (1767–72) to systematize needed shipments to distant places such as Australia, Nova Scotia, and Sierra Leone. This new infrastructure allowed Britain to launch large expeditions to the Continent during the French Revolutionary War and to develop a global network of colonial garrisons.
Before the Napoleonic wars, military supply was based on contracts with private companies, looting and requisition (legal taking of whatever the army needed, with minimal compensation). Napoleon made logistical operations a major part of French strategy. During the Ulm Campaign in 1805, the French army of 200,000 men had no need for time-consuming efforts to scour the countryside for supplies and live off the land, as it was well provided for by France's German allies. France's ally, the Electorate of Bavaria, turned the city of Augsburg into a gigantic supply center, allowing the Grande Armée, generously replenished with food, shoes and ammunition, to quickly invade Austria after the decisive French victory at Ulm. Napoleon left nothing to chance, requesting the Bavarians to prepare in advance a specified amount of food at certain cities such as Würzburg and Ulm, for which the French reimbursed them. When French demands proved excessive for the German principalities, the French army used a system of vouchers to requisition supplies and keep the rapid French advance going. The agreements with French allies permitted the French to obtain huge quantities of supplies within a few days' notice. Napoleon built up a major supply magazine at Passau, with barges transporting supplies down the Danube to Vienna to maintain the French army prior to the Battle of Austerlitz in combat readiness. In 1807, Napoleon created the first military train regiments — units entirely dedicated to the supply and the transport of equipment.
The French system fared poorly in the face of a guerrilla warfare that targeted supply lines during the Peninsular War in Spain, and the British blockade of Spanish ports. The need to supply a besieged Barcelona made it impossible to control the province and ended French plans to incorporate Catalonia into Napoleon's Empire.
The first theoretical analysis of this was by the Swiss writer, Antoine-Henri Jomini, who studied the Napoleonic wars. In 1838, he devised a theory of war based on the trinity of strategy, tactics, and logistics.
Railways and steamboats revolutionized logistics by the mid-19th century.
In the American Civil War (1861–65), both armies used railways extensively, for transport of personnel, supplies, horses and mules, and heavy field pieces. Both tried to disrupt the enemy's logistics by destroying trackage and bridges. Military railways were built specifically for supporting armies in the field.
During the Seven Weeks War of 1866, railways enabled the swift mobilization of the Prussian Army, but the problem of moving supplies from the end of rail lines to units at the front resulted in nearly 18,000 tons trapped on trains unable to be unloaded to ground transport. The Prussian use of railways during the Franco-Prussian War is often cited as a prime example of logistic modernizations, but the advantages of maneuver were often gained by abandoning supply lines that became hopelessly congested with rear-area traffic.
World War I
With the expansion of military conscription and reserve systems in the decades leading up to the 20th century, the potential size of armies increased substantially, while the industrialization of firepower (bolt-action rifles with higher rate-of-fire, larger and more artillery, plus machine guns) was starting to multiply the potential amount munitions each required. Military logistical systems, however, continued to rely on 19th century technology.
When World War I started, the capabilities of rail and horse-drawn supply were stretched to their limits. Where the stalemate of trench warfare took hold, special narrow gauge trench railways were built to extend the rail network to the front lines. The great size of the German Army proved too much for its railways to support except while immobile. Tactical successes like Operation Michael devolved into operational failures where logistics failed to keep up with the army's advance over shell-torn ground.
On the seas, the British blockade of Germany kept a stranglehold on raw materials, goods, and food needed to support Germany's war efforts, and is considered one of the key elements in the eventual Allied victory in the war. At the same time, Germany's unrestricted submarine warfare showed the vulnerability of shipping lanes despite Allied naval superiority.
World War II
The mechanization of warfare, starting at the tail end of World War I, added increasing ammo, fuel, and maintenance needs of tanks and other combat vehicles to the burden on military logistics. The growing needs of more powerful and numerous military ships and aircraft increased this burden even further. On the other hand, mechanization also brought trucks to logistics; though they generally require better roads and bridges, trucks are much faster and far more efficient than fodder-bound horse-drawn transport. While many nations, including Germany, continued to rely on wagons to some extent, the US and UK readily switched to trucks wherever possible.
Military logistics played a significant role in many World War II operations, especially ones far from industrial centers, from the Finnish Lapland to the Burma Campaign, limiting the size and movement of any military forces. In the North African Campaign, with a lack of rail, few roads, and hot-dry climate, attacks and advances were timed as much by logistics as enemy actions. Poor logistics, in the form of Russia's vast distances and its state of road and rail networks, contributed to the fate of Germany's invasion of the USSR: despite many battlefield victories, the campaign lost momentum before the gates of Moscow.
Breaking the logistics supply line became a major target for airpower; a single fighter aircraft could attack dozens of supply vehicles at a time by strafing down a road, many miles behind the front line. Air superiority became critical for almost any major offensive in good weather. Allied air forces took out German-controlled bridges and rail infrastructure throughout northern France to help ensure the success of the Normandy landings, but after the breakout from Normandy, this now limited the Allies' own logistics. In response, the Red Ball Express was organized — a massive truck convoy system to supply the advance towards Germany. During the Battle of Stalingrad, Supplying by air, called an airbridge, was attempted by Germany to keep its surrounded 6th Army supplied, but they lacked sufficient air transport. Allied airbridges were more successful, in the Burma Campaign, and in "The Hump" to resupply the Chinese war effort. (A few years after the war, the Berlin Air Lift was successful in supplying the whole non-Soviet half of the city.)
At sea, the Battle of the Atlantic began in the first days of the war and continued to the end. German surface raiders and U-boats targeted vital Allied cargo ship convoys supplying English, US, and Russian forces, and became more effective than in World War I. Technological improvements in both U-boats and anti-submarine warfare raced to out-do each other for years, with the Allies eventually keeping losses to U-boats in check.
Logistics was a major challenge for the American war effort, since wartime material had to be supplied across either the Atlantic or the even wider Pacific Ocean. Germany undertook an aggressive U-boat campaign against American logistics on the Atlantic, but the Japanese neglected to attack shipping in the Pacific, using their submarines to fight alongside the surface Navy in large-scale battles.
Long logistical distances dominated the Pacific War. For the attack on Pearl Harbor, the Japanese required numerous oiler ships to refuel the attacking fleet at sea on-route. Massive numbers of transports, including thousands of US Liberty ships, were required to sustain the Allied forces fighting back towards the Japanese homeland. As in the Atlantic, submarine warfare accounted for more losses than naval battles, with over 1,200 merchant ships sank.
Logistics, occasionally referred to as "combat service support", must address highly uncertain conditions. While perfect forecasts are rarely possible, forecast models can reduce uncertainty about what supplies or services will be needed, where and when they will be needed, or the best way to provide them.
Ultimately, responsible officials must make judgments on these matters, sometimes using intuition and scientifically weighing alternatives as the situation requires and permits. Their judgments must be based not only upon professional knowledge of the numerous aspects of logistics itself but also upon an understanding of the interplay of closely related military considerations such as strategy, tactics, intelligence, training, personnel, and finance.
However, case studies have shown that more quantitative, statistical analysis are often a significant improvement on human judgment. One such recent example is the use of Applied Information Economics by the Office of Naval Research and the Marine Corps for forecasting bulk fuel requirements for the battlefield.
In major military conflicts, logistics matters are often crucial in deciding the overall outcome of wars. For instance, tonnage war—the bulk sinking of cargo ships—was a crucial factor in World War II. The successful Allied anti-submarine campaign and the failure of the German Navy to sink enough cargo in the Battle of the Atlantic allowed Britain to stay in the war and the ability to maintain a Mediterranean supply chain allowed the maintenance of the second front against the Nazis in North Africa; by contrast, the successful U.S. submarine campaign against Japanese maritime shipping across Asian waters effectively crippled its economy and its military production capabilities and the Axis were unable to consistently maintain a supply chain to their North African forces with on average 25% fewer supplies than required being landed and critical fuel shortages dictating strategic decisions. In a tactical scale, in the Battle of Ilomantsi, the Soviets had an overwhelming numerical superiority in guns and men, but managed to fire only 10,000 shells against the Finnish 36,000 shells, eventually being forced to abandon their heavy equipment and flee the battlefield, resulting in a Finnish victory. One reason for this was the successful Finnish harassment of Soviet supply lines.
More generally, protecting one's own supply lines and attacking those of an enemy is a fundamental military strategy; an example of this as a purely logistical campaign for the military means of implementing strategic policy was the Berlin Airlift.
Military logistics has pioneered a number of techniques that have since become widely deployed in the commercial world. Operations research grew out of WWII military logistics efforts. Likewise, military logistics borrows from methods first introduced to the commercial world.
The Kargil Conflict in 1999 between India and Pakistan also referred to as Operation Vijay (Victory in Hindi) is one of the most recent examples of high altitude warfare in mountainous terrain that posed significant logistical problems for the combating sides. The Stallion which forms the bulk of the Indian Army's logistical vehicles proved its reliability and serviceability with 95% operational availability during the operation.
Loss of Strength Gradient
Geographic distance is a key factor in military affairs. The shorter the distance, the greater the ease with which force can be brought to bear upon an opponent. This is because it is easier to undertake the supply of logistics to a force on the ground as well as engage in bombardment. The importance of distance is demonstrated by the Loss of Strength Gradient devised by Kenneth Boulding. This shows the advantage of supply that is forward based.
U.S. Armed Forces classes of supply
|Class I||Subsistence (food), gratuitous (free) health and comfort items.||Troops|
|Class II||Clothing, individual equipment, tent-age, organizational tool sets and kits, hand tools, unclassified maps, administrative and housekeeping supplies and equipment.||Troops|
|Class III||Petroleum, Oil and Lubricants (POL) (package and bulk): Petroleum, fuels, lubricants, hydraulic and insulating oils, preservatives, liquids and gases, bulk chemical products, coolants, deicer and antifreeze compounds, components, and additives of petroleum and chemical products, and coal.||Equipment|
|Class IV||Construction materials, including installed equipment and all fortification and barrier materials.||Troops|
|Class V||Ammunition of all types, bombs, explosives, mines, fuzes, detonators, pyrotechnics, missiles, rockets, propellants, and associated items.||Equipment|
|Class VI||Personal demand items (such as health and hygiene products, soaps and toothpaste, writing material, snack food, beverages, cigarettes, batteries, alcohol, and cameras—nonmilitary sales items) and paperclips.||Troops|
|Class VII||Major end items such as launchers, tanks, mobile machine shops, and vehicles.||Equipment|
|Class VIII||Medical material (equipment and consumables) including repair parts peculiar to medical equipment. (Class VIIIa – Medical consumable supplies not including blood & blood products; Class VIIIb – Blood & blood components (whole blood, platelets, plasma, packed red cells, etc.).||Troops|
|Class IX||Repair parts and components to include kits, assemblies, and sub-assemblies (repairable or non-repairable) required for maintenance support of all equipment.||Equipment|
|Class X||Material to support nonmilitary programs such as agriculture and economic development (not included in Classes I through IX).||Civilians|
|Miscellaneous||Water, salvage, and captured material.||Troops|
Supply chain management in military logistics often deals with a number of variables in predicting cost, deterioration, consumption, and future demand. The US Military's categorical supply classification was developed in such a way that categories of supply with similar consumption variables are grouped together for planning purposes. For instance peacetime consumption of ammunition and fuel will be considerably less than wartime consumption of these items, whereas other classes of supply such as subsistence and clothing have a relatively consistent consumption rate regardless of war or peace. Troops will always require uniform and food. More troops will require equally more uniforms and food.
In the table above, each class of supply has a consumer. Some classes of supply have a linear demand relationship—as more troops are added more supply items are needed—as more equipment is used more fuel and ammo is consumed. Other classes of supply must consider a third variable besides usage and quantity: time. As equipment ages more and more repair parts are needed over time, even when usage and quantity stays consistent. By recording and analyzing these trends over time and applying to future scenarios, the US military can accurately supply troops with the items necessary at the precise moment they are needed. History has shown that good logistical planning creates a lean and efficient fighting force. Lack thereof can lead to a clunky, slow, and ill-equipped force with too much or too little supply.
- Aerial refueling
- Army engineering maintenance
- Expeditionary energy economics
- Expeditionary maneuver warfare
- Integrated logistics support
- Line of communication or communications (LOC)
- Logistician (see): Logistics Officer
- Military Engineering
- Military supply chain management
- NATO Stock Number
- Performance-based logistics
- Principles of sustainment
- Train (military)
- Tooth-to-tail ratio
- Underway replenishment
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For transport, the [standard 1944 German Infantry] division had 615 motor vehicles and 1,450 horse-drawn vehicles.
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