For much of history, humans have used some form of cavalry for war and, as a result, cavalry tactics have evolved over time. Tactically, the main advantages of cavalry over infantry troops were greater mobility, a larger impact, and a higher position. Predecessors Chariot tactics had been the basis for using the horse in war. The chariot's advantage of speed was outdone by the agility of riding on horseback. The ability of horsemen to pass more difficult terrain was also crucial to this change. Horsemen supplanted most light chariots. In Celtic warfare, light chariots (essedum) persisted among mounted troops, for their ability to transport heavily armoured warriors and as mobile command platforms. Riding and fighting on horseback At first it was not considered effective to use weapons on horseback, but rather to use the horse as transportation. "Mounted infantry" would ride to battle, and then dismount to fight. For a long time, riders and charioteers worked alongside each other in the cavalry. Early domesticated horses were smaller and shorter than the warhorses of later history. Combined with a lack of developed cavalry tactics and the skittish nature of an untrained horse, fighting on horseback was unintuitive at first. The first recorded instance of mounted warriors are the mounted archers of the Iranian tribes appearing in Assyrian records from the 9th century BC. Mongolian troops had a Buryat bow, for showering the enemy with arrows from a safe distance. The aim on horseback was better than in a jiggling chariot, after it was discovered that the best time to shoot was while all the hooves of the horse were in the air. Nevertheless, an archer in a chariot could shoot potentially stronger infantry bows. Javelins were employed as a powerful ranged weapon by many cavalries. They were easy to handle on horseback. Up to ten javelins would be carried, depending on their size and weight. Thrown javelins have less range than arrows, but often prevailed in use nevertheless, due to the mass of the weapon, there was a greater armour-piercing capability and usually inflicted fatal wounds more frequently than arrows. Usage is reported for both light cavalry and heavy cavalry, for example, by the Numidia and Mongol light cavalry, and the Celtic, Cataphract, and Mamluk heavy cavalry. The Celtic horsemen's training was copied by the Roman equites. A significant element learned from the Celts was turning on horseback to throw javelins