You tack the horse up, but rather than mounting, you clip two long rope to each side of the bit, slide the ropes through the stirrups, and then walk behind the horse and begin teaching it to respond to your cues, even when he can't see you. Most of the time you use a verbal cue to get them to walk or speed up, and then use the rope as if they were reins to turn and stop the horse.
A surcingle is generally used for ground driving training of new horses.
The horse you are looking for in this question is a cob: or a shire horse:
there are traces of ground up horse hair in the mix.
Driving
I'm a little confused about what your asking... try to be clearer next time. But I think your talking about ground tying a horse? Where the horse is trained to stay in place if the reins/lead rope touches the ground/is near the ground.
Ground tying means placing a picket into the ground and tying the horse to it. Ground tying is usually used by cowboys. It is more safer to tie at least even with the horse's head because the horse will catch it's leg in the rope if not careful.
If a horse didn't touch the ground, it would be flying. At a full gallop, all four feet are briefly off the ground (called the suspension period).
Horses are used to eating on the ground. If they see it laying on the ground they will eat it.
Dark Horse.
RADISH
Moving an airplane on the ground is called 'taxiing'
A halter and leadrope, or a lunge line, or you could ground drive it, when you clip to long ground driving rope to the bit, slide the rope through the stirrups, and act as if you were riding the horse, only controlling him with the ropes, slapping them to get the stirrups to kick him to go, and turning and stopping him as if you would in the saddle with normal reins.