Unskilled workers included porters, people, water carriers, and one muleteer. A muleskinner or mule skinner is a muleteer or mule-driver. "Mule skinner" (or "muleskinner") is slang for muleteer, a driver or wrangler of mules. In spite of his help the muleteer went on without him. In English, an "arriero" is one type of muleteer, a wrangler of pack animals.