As the United States came into its own as a world power in the late 19th and early 20th centuries, the United States Marine Corps became the primary tool for power projection into troubled areas. The Marines deployed all over the world, fighting everywhere from the Boxer Rebellion in China to the Banana Wars in Central America. During this time, the Marines and a few Army units gained valuable experience. A few USMC legends such as Dan Daly and Smedley Butler gained prominence. It makes sense that in the 1930's, the Marines published the Small Wars Manual, documenting their experiences and providing guidance for units engaged in such conflicts. Unfortunately, just as the Marines were perfecting their craft, World War II broke out. With the ensuing Cold War, these ideas were very nearly lost to history.