The movie is D.W. Griffith's The Battle, which he made for the Biograph company in 1911 and was one of a number of films the director made dealing with the subject of the Civil War. The actors in the shot above are Charles West, a leading man at Biograph who would continue acting in bit parts until 1940; and Blanche Sweet, who was a favorite leading lady of Griffith's during this period, appearing in such films as The Massacre and Judith of Bethulia.
The premise of The Battle involves a young soldier in the Union army who is separated from his girlfriend when he is called to march into war. During the fighting, he becomes panic-stricken, deserts his fellow soldiers, and seeks refuge in the girl's house. She laughs at him and brands him a coward, but when the boy sees his comrades facing almost certain defeat at the hands of the enemy, he summons up the courage to go back to fight, commandeering a supply wagon and delivering the troops with the ammunition they need to win the battle. In the end, he is reunited with the girl and recognized for his bravery.
Overall, it is a fairly routine melodrama, one of many of its kind that Griffith turned out during this period of his career. It is mainly of interest for some well-staged battle scenes that play like a kind of warm-up for The Birth of a Nation. I had seen the clip of the film used in the Young Indiana Jones episode years before I saw the actual film in its entirety; when I finally did, I recognized it instantly, and was reminded of the attention to historical detail that made the Young Indiana Jones Chronicles such a rewarding program to watch.
I wonder if Pancho Villa and his men ever actually saw the film?