Skirmishers are light infantry or light cavalry soldiers deployed as a vanguard, flank guard or rearguard to screen a tactical position or a larger body of friendly troops from enemy advances. They may be deployed in a skirmish line, an irregular open formation that is much more spread out in depth and in breadth than a traditional line formation. Their purpose is to harass the enemy by engaging them in only light or sporadic combat to delay their movement, disrupt their attack, or weaken their morale. Such tactics are collectively called skirmishing. An engagement with only light, relatively indecisive combat is sometimes called a skirmish even if heavier troops are sometimes involved. Skirmishers can be either regular army units that are temporarily detached to perform skirmishing or specialty units that were specifically armed and trained for such low-level irregular warfare tactics. Light infantry, light cavalry (historically), and irregular units often specialize in skirmishing. Skirmishers' open formations and smaller numbers can give them superior mobility over the regular forces, allowing them to engage only on favorable terms, taking advantage of better position or terrain, and quickly withdrawing from any threat of superior enemy forces. Though often critical in protecting the main army from sudden enemy advances, skirmishers were historically poor at taking or defending ground from heavy infantry or heavy cavalry.
Ancient history
In ancient warfare, skirmishers typically carried bows, javelins, slings and sometimes light shields. Acting as light infantry with their light arms and minimal armour, they could run ahead of the main battle line; release a volley of arrows, sling stones, or javelins; and retreat behind their main battle line before the clash of the opposing main forces. The aims of skirmishing were to disrupt enemy formations by causing casualties before the main battle and to tempt the opposing infantry into attacking prematurely, thus throwing their organization into disarray. Skirmishers could also be effectively used to surround opposing soldiers in the absence of friendly cavalry. Once preliminary skirmishing was over, skirmishers participated in the main battle by shooting into the enemy formation, or they joined in melée combat with daggers or short swords. Their mobility made skirmishers also valuable for reconnaissance, especially in wooded or urban areas. In Classical Greece, skirmishers originally had a low status. For example, Herodotus, in his account of the Battle of Plataea of 479 BC, mentioned that the Spartan Army fielded 35,000 lightly armed helots to 5,000 hoplites, but there is no mention of them in his account of the fighting. Often, Greek historians ignored them altogether, but Xenophon distinguished them explicitly from the statary troops. It was far cheaper to equip oneself as lightly armed than a fully-armed hoplite. Indeed, it was common for the lightly armed to go into battle equipped with stones. The low status of skirmishers reflected the low status of the poorer sections of society that made up skirmishers. Additionally, hit-and-run tactics went against the Greek ideal of heroism. Plato gives the skirmisher a voice to advocate "flight without shame" but only to denounce it as an inversion of decent values. Nevertheless, skirmishers then chalked up significant victories, such as the Athenian defeat at the hands of the Aetolian javelin men in 426 BC and, during the same war, the Athenian victory at the Battle of Sphacteria. Skirmisher infantry gained more respect in subsequent years, as their usefulness was more widely recognised and as the ancient bias against them waned. Peltasts, light javelin infantry, played a vital role in the Peloponnesian War, and well-equipped skirmisher troops such as thureophoroi and thorakites would be developed to provide a strong mobile force for the Greek and the Macedonian armies. The Celts did not, in general, favour ranged weapons. The exceptions tended not to include the use of skirmishers. The Britons used the sling and javelin extensively but for siege warfare, not skirmishing. Among the Gauls, likewise, the bow was employed to defend a fixed position. The Celts' lack of skirmishers cost them dearly during the Gallic Invasion of Greece of 279 BC when they found themselves helpless in the face of Aetolian skirmishing tactics. Thracians were famous for their skirmish war tactics and offered their services as mercenaries more than once in the Greek civil wars in ancient times. In the Punic Wars, despite the Roman and Carthaginian armies' different organisations, both had the role for skirmishers as screening the main armies. The Roman legions had a specialised infantry class, Velites, which acted as skirmish troops who engaged the enemy before the Roman heavy infantry made contact, and the Carthaginians recruited their skirmishers from the native peoples across the Carthaginian Empire. The Roman army of the late republican and early imperial periods frequently recruited foreign auxiliary troops to act as skirmishers to supplement the citizen legions.
Middle Ages Medieval skirmishers were generally commoners armed with crossbows or longbows. In the 14th century, although long held in disdain by the aristocratic Castilian heavy cavalry, the crossbowmen contributed greatly to the Portuguese victory at the Battle of Aljubarrota. Similarly, English archers played a key role in the English victory over French heavy cavalry at the Battle of Crécy. In the next century, they largely repeated that feat at the Battle of Agincourt.
Early modern period
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