Don't you recognize the scene? It's the Battle of San Juan Hill -- July 1, 1898. Criminy, they don't teach kids anything in school these days! It was this battle, among others in Cuba, that led to the development of the 1903 Springfield rifle, as the Krag-Jørgensen proved (as you can see in the picture) to have an inadequate rate of fire compared to the Spaniards' Mausers.
This excellent true to life image from history has been attributed to deviantART user Matthew McKeown.
Gallery Link via Geekosystem