The horse has been the most widely-used animal throughout the recorded history of warfare. Early mounts could be used to pull a chariot or to carry lightly armored skirmishing forces. With the appearance of heavier mounts and the invention of the stirrup, the horse-mounted cavalry became the most prestigious military arm for several centuries. A knight's warhorse was trained to bite and kick. The combination of the horse-mounted warrior armed with a bow made the steppe people's armies the most powerful military force in Asian history. The first use of horses in warfare occurred over 5000 years ago. The earliest evidence of horses ridden in warfare dates from Eurasia between 4000 and 3000 BC.