Trigger Rider is a term used to describe a type of cowboy who would ride ahead of a herd of cattle and set off explosives to scare the cattle into moving. The term was popularized by the western novel 'Trigger Rider' written by Will ROGERS and Roy ROGERS, two of the most famous cowboys in American history. Will ROGERS was an actor, humorist, and social commentator, while Roy ROGERS was an actor and singer who starred in many western films.