The Dreamer is one of my favorites. I actually don't usually take the time to follow webcomics, but that was one that caught my eye. It takes place (partly) during the American Revolutionary War and does have mild blood/violent content in a few scenes. Nothing too extreme, I think, but just a heads-up if anyone is especially sensitive to that. There's some occasional swearing, too, but again, shouldn't be too bad. The first couple pages are pretty much the full extent of the "sexual" scenes and not much at all, so I wouldn't worry about that. :)
Here's a synopsis of the series (taken from the website because I'm lazy.) If you're interested in historical fiction like I am, I'd definitely recommend taking a look!
Beatrice “Bea” Whaley seems to have it all; the seventeen year old high school senior is beautiful, wealthy and the star performer of the drama club. And with her uncle’s connections to Broadway theater, the future looks bright ahead of her. Little does she know that her future might actually be brighter behind her.
Bea begins having vivid dreams about a brave and handsome soldier named Alan Warren–a member of an elite group known as Knowlton’s Rangers that served during the Revolutionary War. Prone to keeping her head in the clouds, Bea welcomes her nightly adventures in 1776; filled with danger and romance they give her much to muse about the next day. But it is not long before Beatrice questions whether her dreams are simply dreams or something more. Each night they pick up exactly where the last one ended. And the senses–the smell of musket shots and cannons, the screams of soldiers in agony, and that kiss–are all far more real than any dream she can remember.