Who were the rough riders?

The nickname for Roosevelt's army during the Spanish-American war. The group was made up of Native Americans, miners, cowhands, buffalo soldiers, etc.
The Rough Riders was a nickname given to the 1st United States Volunteer Cavalry, one of three such regiments raised in 1898 for the Spanish–American War and the only one of the three to see action. Initially commanded by Col. Leonard Wood, it was later commanded by Theodore Roosevelt, who was later President of the US. The members were people with experience in horsemanship in rough terrain- thus "Rough Riders".