OK so this is kind of a general point, but I'm mentioning it because of how wild the mass death of the Dothraki army is. At the very start of the battle, Melisandre arrives out of freakin' nowhere and helpfully lights all of the Dothraki's signature curved blades on fire à la Beric Dondarrion. They proceed to be the first wave of fighters to charge into the darkness where the wights are waiting, lead by Jorah and Ghost. Unfortunately the wave of the undead pretty much instantly takes out nearly the entire group of warriors — only a very small handful of men come racing back to safety (Jorah, some horses, a few others).