Shockingly, medieval warhorses weren't as huge and amazing as depicted in TV and movie accounts, although they were still highly valued at the time.
Medieval warhorses are often depicted as massive and powerful beasts, but in reality many were no more than pony-sized by modern standards. . . . Horses during the period were often below 14.2 hands high. . . . Researchers analysed the largest dataset of English horse bones dating between AD 300 and 1650, found at 171 separate archaeological sites.