Lady By Chance House of Haverstock series, Book 1

Driven by fierce patriotism to England, the Marquess of Haverstock will do anything to reclaim the money his best friend lost at cards, money that was to purchase battle plans from a French official. The bewitchingly beautiful but illegitimate Anna De Mouchet agrees to give the marquess back the money she "won." On one condition: that he marry her. From this forced marriage rises a love as powerful as the canons of the war which tears them apart.