McKenzie's Hundred by Frank Yerby

WAR OF HEARTS
They called her Rambling Rose McKenzie, a woman so wild and sweet, so high-spirited, no man could tame her -- or resist trying. Her birthright was McKenzie's Hundred, rich Virginia acres threatened by a desperate war.

Blind devotion stirred her to challenge the enemy in the most dangerous way a woman can. Unloosing her deepest passions for the South, she made sensuality and seduction into deadly weapons of desire. Intrigue would sweep her from Washington to Europe's most decadent salons - to a man she hated herself for loving, and into a dangerous obsession born from war's fury and the darkest places of the heart...

Paperback, 1986

Goodreads: 3.55