Editing Let's roll (section)

==Origins==
{{original research|section|date=September 2019}}
In the [[American west]], many [[wagon trains]] began their journeys with the shout "Wagons roll!" from the head of the train. A less formal terminology would soon develop from the historic precedent. The phrase, "let's roll" has been used as early as 1908 in the cadence song now called "[[The Army Goes Rolling Along]]", which likely extended into [[tank]] usage. 

"[[The Roads Must Roll]]", a science fiction story written in 1940 by [[Robert A. Heinlein]], mentions a re-worded version of "The Roll of the Caissons" called "Road Songs of the Transport Cadets". The protagonist of the 1937 [[supernatural]] [[comedy]], ''[[Topper (film)|Topper]]'', played by Cary Grant, uses the phrase "Let's roll" to his wife, played by Constance Bennett, to indicate they should immediately exit their friend's stuffy office and find a drink. The protagonist of [[Ernest Hemingway]]'s 1950 novel ''[[Across the River and into the Trees]]'', Colonel Dick Cantwell, based on [[World War II]] commander Charles "Buck" Lanham, uses the phrase to his driver. The verb "roll" has been used in both the [[film]] and [[recording industry]] to signal the beginning of a film or [[audio recording]].