Definition of the Rough Riders noun from the Oxford Advanced Learner's Dictionary

 

the Rough Riders

 noun
noun
BrE
 
; NAmE
 
[plural]
 
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the popular name for the First Regiment of US Cavalry Volunteers in the Spanish-American War. They included many cowboys and were led by Colonel Leonard Wood and Lieutenant Colonel (later President) Theodore Roosevelt. They became famous for their part in the victory at San Juan Hill in Cuba (1898), led by Roosevelt on his horse Little Texas.