Which battle was a significant conflict during the Spanish-American War?

The Battle of San Juan Hill was a significant conflict during the Spanish-American War, which occurred in 1898. This battle is particularly notable for the charge led by American forces, including the famed Rough Riders, under the command of Theodore Roosevelt. The successful assault on San Juan Heights helped secure a decisive victory for the United States in the war against Spain, leading to the capture of Santiago de Cuba. The victory at San Juan Hill played a crucial role in demonstrating American military power and contributed to the swift resolution of the conflict, resulting in the signing of the Treaty of Paris later that year, which marked the end of Spanish colonial rule in the Americas.

In contrast, the other battles mentioned in the options occurred during separate conflicts: Gettysburg and Antietam were pivotal battles in the American Civil War, while the Battle of New Orleans took place during the War of 1812. These battles, although significant in their own right, are not related to the Spanish-American War and thus do not pertain to the context of this question.