 Research undertaken at the Museum of London, using literary, pictorial and archaeological sources, supports military horses of , distinguished from a riding horse by its strength and skill, rather than its size.This average does not seem to vary greatly across the medieval period.Horses appear to have been selectively bred for increased size from the 9th and 10th centuries, and by the 11th century the average warhorse was probably , a size verified by studies of Norman horseshoes as well as the depictions of horses on the Bayeux Tapestry.