History By definition, "irregular" is understood in contrast to "regular armies," which grew slowly from personal bodyguards or elite militia. In Ancient warfare, most civilized nations relied heavily on irregulars to augment their small regular army. Even in advanced civilizations, the irregulars commonly outnumbered the regular army. Sometimes entire tribal armies of irregulars were brought in from internal native or neighboring cultures, especially ones that still had an active hunting tradition to provide the basic training of irregulars. The regulars would only provide the core military in the major battles; irregulars would provide all other combat duties. Notable examples of regulars relying on irregulars include Bashi-bazouk units in the Ottoman Empire, auxiliary cohorts of Germanic peoples in the Roman Empire, Cossacks in the Russian Empire, and Native American forces in the American frontier of the Confederate States of America. One could attribute the disastrous defeat of the Romans at the Battle of the Teutoburg Forest to the lack of supporting irregular forces; only a few squadrons of irregular light cavalry accompanied the invasion of Germany when normally the number of foederati and auxiliaries would equal the regular legions. During this campaign the majority of locally recruited irregulars defected to the Germanic tribesmen led by the former auxiliary officer Arminius. During the decline of the Roman Empire, irregulars made up an ever-increasing proportion of the Roman military. At the end of the Western Empire, there was little difference between the Roman military and the barbarians across the borders. Following Napoleon's modernisation of warfare with the invention of conscription, the Peninsular War led by Spaniards against the French invaders in 1808 provided the first modern example of guerrilla warfare. Indeed, the term of guerrilla itself was coined during this time. As the Industrial Revolution dried up the traditional source of irregulars, nations were forced take over the duties of the irregulars using specially trained regular army units. Examples are the light infantry in the British Army. Irregular regiments in British India Prior to 1857 Britain's East India Company maintained large numbers of cavalry and infantry regiments officially designated as "irregulars", although they were permanently established units. The end of Muslim rule saw a large number of unemployed Indian Muslim horsemen, who were employed in the army of the EIC. British officers such as Skinner, Gardner and Hearsay had become leaders of irregular cavalry that preserved the traditions of Mughal cavalry, which had