Who made up theodore roosevelt's rough rider force that captured kettle and san juan hills in cuba?

The Rough Riders comprised of a collection of Western cowboys and wealthy Eastern blue bloods officially known as the First U.S. Voluntary Cavalry. They were  the first voluntary cavalry in the Spanish-American War which pitted the U.S against Spain over Spain's colonial policies with Cuba.

from the conditions of the working class in england by friedrich engels,the main idea is :