Novels set during Spanish Civil War or America pre-independance?

Jeff Sharra has written a number of historical fictions about American wars. Check for "Rise to Rebellion" and "The Glorious Cause" about the American Revolution. I don't think he's written any about the Spanish Civil war, but there are a number of others. His father, Michael Sharra, wrote an excellent book about the battle of Gettysburg in the American Civil War also called, "The Killer Angels."