Mavreen or Scarlett

She was the daughter of an English aristocrat and a young and gentle governess. She was lovely, intelligent, and had a quality that drew all men to her, ensnaring them fatally in a web of charm. Stubborn in her loyalties, passionate in her affections, her one flaw was her uncontrollable and tempestuous nature...
Sir John Danesfield, captivated by his illegitimate daughter's spirit, takes her to Georgian London to live with his mistress. At the age of fifteen, she falls in love with the Vicomte Gerard de Valle, an impoverished French nobleman. Believing him lost to her, she enters a loveless marriage arranged by her father.
But she can never forget the man who had captured her heart. When her husband dies she embarks on an epic journey across the Napoleonic war-ravaged wastes of Europe. It is finally to the snowy battlefields of Russia that Mavreen, passionate, headstrong, and courageous, goes in search of the man she loves.

Women of Fire Series:
Mavreen (Women of Fire #1)
Tamarisk (Women of Fire #2)
Chantal (Women of Fire #3)