Everything, everyone used them as a sorts of mules. They would be tied in groups of two or four, placed bellow a plank of wood with a clothpiece and they had to hold it on top and be used for weight carrying. Or you could have two to eight of them carry you around in a palanquin or have them pull a wagon or actually use them as mounts for your mount, by carrying the mount and you on the plank, that normally did require at least eight of them.
That's PvP to a new evil level...