By 1920, a war had broken out in the Kentucky Cave Country – a war of economics. The combatants were the Mammoth Cave Estate and practically everyone else who owned a cave in Mammoth Cave Ridge and Flint Ridge.
Mammoth Cave, by this time a century-old tourist attraction, had demonstrated the profit to be had in tourism. That other cave owners would seek to share that profit was inevitable, and the competition grew rancorous. Colossal Cave, Long Cave, Short’s Cave, Great Onyx Cave, Indian Cave, Salts Cave and Crystal Cave all vied for the attention of passing mororists bound for the world-famous Mammoth, and strange signs began to sprout by the roadside, reading "DO NOT BE CONFUSED – NO ONE HAS THE RIGHT TO STOP YOU ON THIS ROAD."
Agents from the various caves began intercepting cars on the road, and conversations such as this were not uncommon: