His Trust (1910) 

One of the hardest of Griffith's films to watch, this features one of the most controversial shots in all of silent cinema, featuring a young white girl ride an old black servants back like a horse. This same servant in horrific blackface makeup to boot. Now looking at this scene isolated is tough, however in the context of the film this is remarkably liberal. In the film the black servant winds up saving the daughter's life, as well as the recently deceased master of the house's sword (his honour). Taking a very pro-Confederate stance though this illustrates the "happy slave" mentality that makes it rough. The picture depicts the Union soldiers as looting muderers, and the nobile Southerners as good people, inspiring devotion in their black slaves. This was the first of a two-part series followed by His Trust Fulfilled right after. Not having the extra time to watch the sequel as yet, I'll have to let you know how it concludes later.