The Blue Sword by Robin McKinley

Harry has always been a bit headstrong for society’s approval, so her brother, a soldier stationed at a remote garrison in a dry and distant land, sends for her. She comes to love desert life.  When the king of the native hill folk seeks aid to fend off an impending invasion, he is rejected; however, his magical sense insists Harry is important.  He abducts her and has her trained in battle, at which she excels.  Harry almost immediately feels at home with the hill people and finds that she has a mysterious connection to a revered warrior queen from their past.  It becomes apparent that her destiny lies in the coming battle with their ancient enemy.

This young adult fantasy is a great adventure story featuring a brave and intelligent heroine, who, unsuited to her own society, finds her rightful place in an exotic setting tinged with magic.  It was a Newbery Honor Book in 1983 and its prequel, The Hero and theCrown, won the award in 1985.  Both books are highly recommended for those seeking strong female leads in action-filled fantasy stories, with just a touch of romance.