Answer :
The nickname given to the 1st United States Volunteer Cavalry was the Rough Riders.
Rough Riders was the nickname given to the members of the 1st Volunteer Cavalry in the Spanish-American War. They were volunteers recruited by Theodore Roosevelt and composed of cowboys , miners, law-enforcement officials and colleges athletes, among others. This group joined in the capture of Kettle Hill, then charged across a valley to assist the seizure of San Juan Ridge , the highest point of San Juan Hill.