A person who has charge of one or more wagons; especially, an officer in charge of wagons in a military train.(noun)
The Century Dictionary (Public Domain)
Use "wagon-master" in a sentence
"The Project for the New American Breakdown is headed for the political land-fill scuttled by its luckless wagon-master corporate-George."
"Before the tribe has a chance to enact their own punishment on the two white men and very likely the rest of the wagon train the wagon-master has the two men tied to a wagon wheel and mercilessly whips the snot out of them in front of the Indians."
""What do I owe you?" the wagon-master asks peevishly."