Glad to be of assistance Cheryl. Google "artillery driver's leg guard" and you will find some interesting sites and photos. There is even a Facebook page called "Artillery Drivers." I think they are out of Fayetteville. Below is the exact description of the leg guard that I found on one of the discussion forums that showed up on my search.
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"The Leg guard, : this is what sets the driver apart from the common re-enactor. It stimulates conversation with civilians and other re-enactors alike; a visually impressive object unique to the postilion impression and little understood. The leather and iron leg guard remained unchanged for more than 100 years beginning in the 1830's and is described in the United States Army Ordnance Manual of 1861 as 1 body (strong kip leather 2 layers, sewed to the upper and lower part of the body with four seams; 4 leg-straps, 4 buckles No. 10 and 4 standing-loops, sewed to the body: the billet-ends pass through slits in the body; 1 foot-strap, sewed to the bottom of the body, at both ends; 1 plate, (iron,) 0.1 inch thick, riveted to the body with five rivets. My reproduction comes from Border States Leather works. Pay Pal is the preferred method of payment. Asking price is $50.00 plus shipping."
This is a copy and paste forum post. I know nothing about the selling of this reproduction item.
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We move my gun limbered by hand. We take the picket rope from the limber and pass it through one of the trace hooks on the limber's splinter bar, double the rope and pass the two ends through the eye at the end of the pole yoke. Then tie it off on the opposite trace hook. This makes a great hand hold for retreating infantry to assist in a rapid movement on the field. We used this technique a few weeks ago at The 150th Anniversary of The Storming of Fort Harrison, Battle of New Market Heights, and Second Battle of Deep Bottom. You can see some awesome pics of us in action at www.facebook.com/3rdrichmondhowitzers. It's a public page. You don't even need to be a Facebook user. Enjoy.
Keith