The Cowboy from Sundown (1940)

The droughtplagued ranchers of Sundown have to market their cattle at a loss in order to meet mortgage payments held by banker Cylus Cuttler Then Sheriff Tex Rockett is forced to quarantine all the cattle on the local ranches because of a hoofandmouth disease outbreak Steve Davis herds his cattle to the railhead anyway and Tex is forced to arrest him Urged on by the bankers son Nick Cuttler the angry ranchers storm the jail but Steves sister Bee persuades them to await the trial Steve with Nicks help breaks jail and is told he must kill Tex to aid the ranchers Meanwhile government man Bret Stockton and Tex see Nick and his men treating cattle in an unusual way Tex finally proves that the Cuttlers have been treating the cattle with acid to give a false impression of the hoofandmouth disease