The Rough Riders were instrumental in the US victory against?

The Rough Riders were instrumental in the U.S. victory against Spain during the Spanish-American War, particularly in the pivotal Battle of San Juan Hill in July 1898. Led by Theodore Roosevelt, the volunteer cavalry unit's charge up the hill helped secure a strategic position for American forces. Their bravery and tenacity contributed significantly to the overall success of the campaign in Cuba, ultimately leading to Spain's defeat and the end of the war.