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Light infantry

Type of mobile infantry

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Following World War II, the term "light infantry" has evolved to include rapid-deployment units (including commando and airborne units) that emphasize speed and mobility over armor and firepower. Some units or battalions that historically held a skirmishing role retain their designation "light infantry" for the sake of tradition.

History

Ancient history

The concept of a skirmishing screen is a very old one and was already well-established in Ancient Greece and Roman times in the form, for example, of the Greek peltast and psiloi, and the Roman velites. As with the so-called "light infantry" of later periods, the term more adequately describes the role of such infantry rather than the actual weight of their equipment. Peltast equipment, for example, grew steadily heavier at the same time as hoplite equipment grew lighter. It was that peltasts fought in open order as skirmishers that made them light infantry and that hoplites fought in the battle line in a phalanx formation that made them heavy infantry.

Modern history

Early regular armies of the modern era frequently relied on irregulars to perform the duties of light infantry skirmishers. In particular, the French Army employed detachments of German and Balkan mercenaries to serve as patrols in the rough country until a permanent corps of Mountain Fusiliers (Fusiliers des Montagnes) was raised in the 1740s. In the 17th century, dragoons were sometimes employed as the skirmishers of their day, as mounted infantrymen who rode into battle but dismounted to fight, giving them a mobility lacking to regular foot soldiers.

In the 18th and 19th centuries most infantry regiments or battalions had a light company as an integral part of their composition. Its members were often smaller, more agile men with high shooting ability and capability of using initiative. They did not usually fight in disciplined ranks as did the ordinary infantry but often in widely dispersed groups, necessitating an understanding of skirmish warfare. They were expected to avoid melee engagements unless necessary and would fight ahead of the mainline to harass the enemy before falling back to the main position. During the period 1777–1781, the Continental Army of the United States adopted the British Army practice of seasonally drafting light infantry regiments as temporary units during active field operations, by combining existing light infantry companies detached from their parent regiments.

Light infantry sometimes carried lighter muskets than ordinary infantrymen while others carried rifles and wore rifle green uniforms. These became designated as rifle regiments in Britain and Jäger and Schützen (sharpshooter) regiments in German-speaking Europe. In France, during the Napoleonic Wars, light infantry were called voltigeurs and chasseurs and the sharpshooters tirailleurs. The Austrian army had Grenzer regiments from the middle of the 18th century, who originally served as irregular militia skirmishers recruited from frontier areas. They were gradually absorbed into the line infantry becoming a hybrid type that proved successful against the French, to the extent that Napoleon recruited several units of Austrian army Grenzer to his own army after victory over Austria in 1809 compelled the Austrians to cede territories from which they were traditionally recruited. In Portugal, 1797, companies of Caçadores (Hunters) were created in the Portuguese Army, and in 1808 led to the formation of independent "Caçador" battalions that became known for their ability to perform precision shooting at long distances.

Light infantry officers sometimes carried muskets or rifles, rather than pistols, and their swords were light curved sabres; as opposed to the heavy, straighter swords of other infantry officers. Orders were sent by bugle or whistle instead of drums (since the sound of a bugle carries further and it is difficult to move fast when carrying a drum). Some armies, including the British and French, recruited whole regiments (or converted existing ones) of light infantry. These were considered elite units, since they required specialised training with emphasis on self-discipline, manoeuvre and initiative to carry out the roles of light infantry as well as those of ordinary infantry.

By the late 19th century, the concept of fighting in formation was on the wane due to advancements in weaponry and the distinctions between light and heavy infantry began to disappear. Essentially, all infantry became light infantry in operational practice. Some regiments retained the name and customs, but there was in effect little difference between them and other infantry regiments. On the eve of World War I, the British Army included seven light infantry regiments. These differed from other infantry only in maintaining such traditional distinctions as badges that included a bugle-horn, dark green home service helmets for full dress, and a fast-stepping parade ground march.

Contemporary

Today, the term "light" denotes units lacking heavy weapons and armor or with a reduced vehicle footprint as in opposition to motorized infantry or mechanized infantry, both of which rely heavily on vehicles for both transport and for combat. Light infantry units lack the greater firepower, operational mobility, and protection of mechanized or armored units, but possess correspondingly greater tactical mobility and can execute missions in severely restrictive terrain and areas where weather makes vehicular mobility difficult.

Light infantry forces typically rely on their ability to operate under restrictive conditions, surprise, violence of action, training, stealth, field craft, and fitness levels of the individual soldiers to compensate for their reduced lethality. Despite the usage of the term "light", forces in a light unit actually normally carry heavier individual loads vis-à-vis other forces, because they must – due to their lack of vehicles – carry everything they require to fight, survive, and win.

Although some units are categorized as Air Assault Infantry, Airborne Infantry, Naval infantry or Marines, they also fall under the overall concept of light infantry. Light infantry forces are typically infantry forces intended for difficult terrains such as:

Light infantry has been used for example during the Falklands War in 1982. Both Argentina and the United Kingdom made heavy use of light infantry and its doctrines during the campaign, most notably the Argentine 5th Naval Infantry Battalion (Argentina) and 25th Infantry Regiment (Argentina) and the British Parachute Regiment and Royal Marines of 3 Commando Brigade. Due to the Falkland Islands' rocky and mountainous terrain, the operations on the ground were only made possible with the use of light infantry; the terrain severely limited using mechanized infantry or armor. Additionally, the Falklands are islands with no bridges to mainland, thus deployment of vehicles and heavy weaponry was also limited by the difficulty and danger of sea transport and landing operations. These conditions led to the "Yomp" across the Falklands, in which Royal Marines and Paras yomped (and tabbed) with their equipment across the islands, covering 56 miles (90 km) in three days carrying 80-pound (36 kg) loads after disembarking from ships at San Carlos on East Falkland on 21 May 1982.

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