For decades, folks thought there were six general orders of the Arizona Rangers. They covered stuff like don’t hang out in bars or brothels, enforce gambling laws, stay out of Mexico, treat prisoners humanely, and do your duty with honor.
But in 2009, a researcher discovered a seventh order, written on the back of a document: Rangers had to obey orders.
Apparently, Ranger Captain Harry Wheeler had some discipline problems and needed to put that in writing in 1907. It wasn’t in force for long—the legislature killed the Rangers in 1909.