> horses are big and react poorly to being wounded: a solid arrow hit on a horse is very likely to disable both horse and rider. And while light or archer cavalry might limit exposure to mass arrow fire by attacking in looser formation, as we’ve discussed, European heavy horse generally engages in very tight lines of armored men and horses in order to maximize the fear and power of their impact. Unsurprisingly then, we see from antiquity forward, efforts to armor or protect horses, called ‘barding’: defenses of thick textile, scale, lamellar, and even plate are known in various periods, though of course the more armor placed on the horse, the larger and stronger it needs to be and the slower it moves. Nevertheless, the size and shape of a horse makes it harder to armor than a human and you simply cannot achieve a level of protection for a horse that is going to match a heavy infantryman on the ground, especially if the latter has a large shield.