It's interesting to see in this and other posts, the number of Civil War era horseshoes that have been worn in two. To wear a shoe out that bad takes either leaving the shoe on the horse way too long, or hard riding in rocky ground. Packing mules into the Desolation Valley Wilderness in California, we had shoes wear in two in 4 or 5 weeks, but that ground in the Sierra Nevada is solid granite rock. In soft soil, if a horse is shod in 6 weeks or so, which is what the army recomended, the used shoe could be reset, or used over probably one time, then the second time it would be to thin for resetting, and a new one is used. Of course horses were used for a lot of things besides cavalry, anyway, it gives me something to think about.